I'm really curious what's going on with your rear triangle. I would loosen all the suspension hardware half a turn and see if it moves freely then.

As an aside, do you own a torq wrench? If not I would definitely recommend getting one. I have a park tools set which includes a 1/4" drive wrench, Allen and torx bits, it was like $80. I couldn't help myself on Black Friday and bought basically the same thing at harbor freight for < $10. Without a sale you can probably get a 1/4" torq wrench and bit set from harbor freight for $20.

I'm trying to figure out what frame this is.

https://www.amazon.com/dp/B01HHTWQBW/ref=cm_sw_r_cp_api_vni5ybV12GGV4

The geo number are more modern than any other hardtail I've found. It looks like imust's xp09 but the geo is very different.

http://imust-sports.com/en/product/29-plus-carbon-mtb-frame/

Thanks Dank. I thought some members were already sold on the fs27. I was pretty sold myself. Correct me if I'm wrong, but what I've got from this awesome forum is:
1) there has not been a good trail bike out of China. By good I mean modern geo and quality suspension kinematics.
2) there have been some reliable fun hard tails.
3) there have been some catastrophic failures (mostly road bikes?)
4) there have been some unique offerings, mostly of the plus and fat variety.
5) most of the fs bikes have had significantly lower quality suspension hardware and stiffness compared to the brand names.
I know you get what you pay for. It seems like the value is in the high quality hard tails and roadbikes. But if the fs27 and fm058 are identical in performance to the '17 spark plus and race models with close to the same weight and durability then at 1/3 the price (including shock) they are a great value! My biggest holdup is : is it safe? I like to get rowdy and definitely plan to hit jumps with it. Have any of the Chinese bike been proven to take all mountain level abuse?

My bad, I thought you ordered the FM058 in 17.5 as Hong Fu said they could ship it. I think it cover some issues of the FS27. But anyway, not a bad choice.

Hey guys I just kinda stumbled upon the Chinese Carbon thing while looking for a plus frame. I think I'm going to go for one of the Scott copies when they're available in 19". Can anyone tell me what the difference is between the FM058 and the FS27? Is there a vendor who is more likely to have the most up to date version?

As far as the design goes that cable routing is terrible. But I don't get the concern with the caliper mounting location? Am I wrong in thinking since its a single pivot the seat stay and chain stay are technically the same link?