Thx bud! :D PLA is not the greatest in strength, so you have to use 100% infill and frames with cross braces are usually better. These comments were from the designer on this frame:
"Full Disclaimer: It definetly can take a beating, but it's not invincible so it is not recommend for absolut beginners in the FPV-hobby, unless you are willing to print the frame multiple times.

Speaking of Printing:

I had the best results with PC-ABS (compensate the shrinkage of abs by scaling the model to 100,8% in your slicer) or heat treated Pla (annealing PLA will cause the part to shrink along the x- and y-axis and grow in the z-direction, so you have to compensate by scaling the model in your slicer non proportional. For me the following values worked the best to get an accurate scale after annealing: x=102% y=102%, z=98%)

Stay away from PETG or any fiber filled materials, because they will most likely shatter on impact!

min. printbed area reqired for the frame: 190x190mm

(recommend area with brim: 200x200mm)"
As far as fading, yeah if ya let it roast in the sun it will...lol ;)

they are very amazing. I was worried they'd have issues with the weight, but I can't really tell. I also get a solid 5 minutes of aggressive flying.

Without a doubt you will get less efficiency due to weight increase, but the main point for this upgrade is the flight improvements and lower noise. If you plan to fly this quad like a DJI Mavic then this upgrade may not benefit you much. But if you want to fly it faster, you will see a noticeable increase in performance but with the cost of lower flight times. You are still able to get 12 minutes flight times when doing slow cruising and land before it hits 20%.

Motor kv is 1750, so that should be pretty "zippy" with 6S.... according to my research. The battery might be an issue, I bought a new 6S but haven't tried it yet. The 6S pack I tried was a "fixer upper" from a friend that had frayed wires from a crash, but otherwise seemed fine. Charged up and tested fine, but I'll have to try the other pack.
The motor output could be it...I hovered the quad in my backyard and the motors felt a bit warm..not hot, just warm...which means I might've fiddled with the tune... I'll have to take another look.

When you go to charge the pack you worked on, are the cells even after your flights? I wonder if the cells are different internal resistances? Is the whole pack old and decrepit?
1750 is a legit kv for 6s on 5", but it's the bottom end. I find that under 1800kv it tends to be sluggish, and somewhat similar to 4s power, just with no sag... Low kv, and an old battery that might be the whole thing

I'll try with a fresh battery and also take another look at the tune. I saw a Chris Rosser video where he kinda explained the tune in a way that made sense...🤞

The pack looked good, the cells were all within 0.2 volts or so from another, but it's a cheap CNHL pack... I have a Tatuu R-line one I'll try when I get a chance.

Is it doing anything "funky" in the air? I find the current betaflight is amazing for 5" on the stock tune (typically). I came up in the early days of betaflight, so I understand tuning, if you post a clip, or a good description I can probably help?
I remember ~5 years ago watching LeDrib "moonwalk" HUGE areas in one pulse of the throttle, and seeing that I could be getting MUCH more thrust/acceleration. I went on a quest through motors, frames, props, and batteries to get to that level. It took a well built 6s rig for me to get there, but MOSTLY good batteries. I have gotten that same zip from 4s on 3" and 4", but for a 5" rig you have to buy expensive batteries to get that same zip (like, $40+ per battery) and 6s will do the same on a $20-$25 battery.

It's not really acting "funky", now that I tried the R-line pack it actually flies really nice...one thing that surprised me a lil is the 74 amps it supposedly pulled on a max, with an ESC rated for 60A, but considering that just to be on punches I guess it's fine. Motors were not hot, it flew responsive and since I'm still such an inexperienced pilot I pretty much just fly betaflight presets.
I also watch the LeDrib videos and loooove the hangtime he gets.
This quad has some pretty decent hangtime given my pretty limited skill.

I'll share a DVR video, just let me try to get something watchable this weekend...I just watched my recording from yesterday and it is kinda boring...and it underlines that I'm just a very inexperienced pilot.

I have a similar issue with mine - with 6s 1100mAh I only get about 2 minutes of flight time - motors super hot as well.
https://rotorbuilds.com/build/30870
Unfortunate, as I used identical parts on a different frame and I got easily 5 minutes flight time.
Would very much appreciate to try out some other PID! =)

thats battery is way too big. shoukd be using a 6-800mah 6s max. A full sized go pro is also too heavy you need a light weight sub 50g cam.

so a LiIon will also be too havy?
what Lipo will you recomandace?

will try to do a gopro naked...

I don't think weight is a problem. I built this frame with 7" props, and flew it with a 3S2P 18650 pack (300g). My motors were T-Motor MN1806 1400kV, roughly the same weight as the 2203.5 1500kV. My longest flight time was 70 minutes. Used an old T-Motor CF 7x2.4.

🦃 Happy Thanksgiving Rotorbuilds 🦃

so can i do it entirely only on betaflight?

well the only thing i did with jesc was change motor direction, but i think nowadays you can also do that in betaflight.