RE: Prop Question
I've rarely found a need to ream out the center hole on Vess, Xoar, etc.
I just clamp my PSP prop drilling guide on from one side to drill the prop mounting holes, then
re-position to the other side and tighten the PSP down again, which makes any tight center holes just right.
(The center guide on the PSP will relieve the props center hole somewhat)
Better snug than loose.
As for props pulling up while drilling, that happens when feeding the drill bit in far too fast.