You dont concern yourself with that gap on the bottom of your shim.. seems it will try and spread the stand and split it or crack it off
Nope, not at all concerned. There is no gap, just a little high tack to hold them in place when installing the shafts. If they were shims, I would definitely be concerned about splitting the stands, but they are billet spacers, not flat shim stock.
Sure is contacting on the corner and not on the bottom... I buy those tapered spacers all the time at Mancinis... .030 out to 0 at the ends... maybe your are thicker