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I was using Taulman's Bridge which isn't to far away from 910, definitely better than PETG, and I didn't see much flexing. There was only about 0.4mm of clearance between the printed parts and the extrusion, smaller wheels (or bigger chamfer on the wheels) could definitely be the cause of that.

I think I know where you are going. While I was in the extrusions I took a bunch of measurements and plan to come out with a plug and play wheel version. Probably sooner than later because after an 8 hour print one of the carriages is already loose....