I could be way off here but looking at how much your wheel still moves in that rear triangle and the fact that sounds to me more like something under tension rubbing against cf I would be looking really closely at the dropouts to make sure everything is tight and also aligned where it should be.  As I said, I could be way off and just going by experience with similar sounds on other bikes.

Stupid question, did you upgrade your bolts to JJJ's revised ones?

Exactly what I’m looking for, looking at the possible tyre, bb, headset and rear shock options. Thanks!

If your start reading on page 9 you will get your answers your looking for. I ended up using dpx 210x51 the body fits perfectly, I believe the frame does not accommodate a spring shock. 29x2.4 max tire width or you do start getting tire rub on the rear.  You'll need a Crown race spacer pr your fork will rub the down tube. but, again all information if you read through this forum.

Still possible, hurry. Details here:
https://docs.google.com/spreadsheets/d/1VllNnFhMycufNw3H4toELJPXWNQe-djAg7zDEYvuD0o/edit#gid=0

How do I pay you?

The original question is are you happy aside from the flexing.. and it seems like a lot of complaining. Buyer beware. Your buying a knockoff enough said...

My impressions have been pretty impressed with finish. This is my 3rd 'knockoff'. What helped me was past buyers who ran into trouble first building, IE: The crown race spacer, odds and ends really - made a huge difference in receiving the bike, having all the parts ready and building it. I am 5'8, riding a medium frame. My buddy is 6' and he rides it very comfortably. Is it too long for me? Maybe a cm or so, but I find I can sit inside the bike when hitting slopes that are long and fast. I got mine in the papaya orange and got some blue details that make it look like a Mclaren F1 car.

Here's my current specs;

Groupset - XT 12 speed, 4 piston brakes
Handlebars; Raceface 6C w/ blue labels
Stem; Raceface turbine stubby 35mm
MEC Grips
Raceface turbine cranks with 32T
Look trail pedals
Maxxis minions
Raceface 30mm rims with 370's

I have spoken to Eddy regarding the rear triangle and I am sitting on the fence. I don't live in a Mountain area, I ride Bromont a lot and local trails when I don't. The bike has been very good so far and you really can't beat the price with shipping to Canada.

Cheers!

pretty much done with the build. waiting on a different brake mount adapters and some fork decals

Snacks, build looks great - where did you get he chain stay protector?

Stefan, I see same color and same progress as me more or less  .
BB issue: I think the threaded BB is the way to go, maybe I will install the stock BB with no inner spacer, just to be sure that I could remove it later; ZTTO BB looks good but aliexpress transit time is approx 15 days : otherwise I see in german online shop token makes same threaded BB, just slightly more expensive.
Chainline issue: the difference between shimano XT 8100 and 8120 (or slx 7100 and 7120) is that the first have a chainline of 52 mm and a QR factor of 172 mm, the second has a 55 mm chainline and QR of 178 mm; the "20" series achieve this with a 6 mm longer spindle and adding a 3 mm spacer each side to keep simmetry; on this frame it looks like the 52 mm chainline barely clears the frame: possible solution is adding spacers to BB or to  crank spindle in driver side; this will creat asymmetry in QR factor, but 1-2 mm I think won't be noticeable. As a general rule the more inner the chainline the better it is.

Included with the frame purchase is the BB and spacer which looks like a 3mm. Would that not help clearance for chainring? I'll be installing tonight and having a look at that...

I used dental floss and a vacuum cleaner.

I used nothing. They fed right thru with no issues.