Okay I guess I was wrong. The rear thru axle supplied with my R088 does not fit properly.

I only noticed it when swapping wheelsets. At first I thought it was an issue with the rear wheel freehub I was using, but it's the actual thru axle. The one supplied by SPCycle is 167.5mm long, and I swapped it for a 168mm 1.0p thru axle using a thicker conical shaped washer. Once swapped the whole rear assembly was much stiffer. The rear TA supplied by SPCycle had play in the wheel.