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I also wonder if the u-joint pulsation could be adding to something. on the mini's I have built I used the t1 chromoly 930 stubs and t1 weld in carriers all except one the first test rail but that was lighter than enemy's with even smaller wheels and a low hp honda motor and the carriers were a lot thicker.
"Pad knock off" - which is the term I am used to for this - is common in a lot of circiut racing (pavement) situations. It is common for drivers to need to give a little pump on the brake pedal with their left foot while they are still on the power but approaching a braking marker. This brings the pads out to the disc prior to actually applying the brakes. Pad knock off usually happens because a combination of things allow the disc to knock the pads away.If you are only getting it after jumping maybe you could look at moving the calipers down to the "side" of the disc instead of the top. That may mean the knock off is less and may not be noticable. I know this is fixing the symptom rather than the problem but it may be an easier fix and you may not want to do the proper fix (if, for example, it means tightening bearings too tight etc)
Hard to believe that the 3/8" would be flexing. What offset wheels are you using?
Personally I can see the 3/8 flexing enough.
Perhaps a test could be contrived.Some kind of Epoxy that becomes brittle when dry or something like that be painted in a couple lines across the 3/8 plate in the angle you "think" it is flexing.If the brittle pulls off the 3/8 plate or breaks acorss the line somewhere then you would know the 3/8 plate is the flex issue.Or just build a thick plate that could be bolted to the existing hub mount to see if that stops it? Maybe someone here could come up with a lot better way to test it?