8MM retainers/locks on 5/16 valves: OK or not OK?

OK, the Crane 99121 locks arrived (5/16 10 deg & lash cap recesses (& I am useing the original Lunati 75740 retainers that they (Lunati) say are OK with 5/16 or 8MM valves) ???. The girl at Crane said that the distance from the "center" of the bead lock bulge in the locks up to the tip of the lash cap perimeter in the locks is .110". Since I got .170" from the center of the bead lock concave recess in the valve stem up to the tip of the valve stem I figured this would solve it. WRONG! Upon mockup the L.C. perimeter is flush with the valve tip (maybe the tip is .001 or .002" above the perimeter) so I said enough is enough & I ground down about 2/3 of the lash cap perimeter so the valve tip is up higher than the LC perimeter. A noted builder said to mockup a retainer/pair of locks on a vertical valve (no spring) & let loose & see if they fall (this was a test for the prior 8MM Lunati locks I have) & if they are loose under their own weight then there is an problem & it fell pretty loose but now these "correct" 5/16 locks doing the same test are even looser! & these comp cams locks appear to be poorly machined junk compared to the Lunati works of art (8MM tho). Lunati does have 5/16 ones but they have lash caps which I wanted to avoid but I thought I'd be quite a bit to the good with the dimention she gave me, but I can certainly buy a set & same thing trim the lash cap perimeters cuz they look real nice quality (if you guys say this is a good move). I was thinking if I mighta messed up the heat treatment by grinding on these CC locks but I tried to go slow but I didn't go as slow as I should have (I was seein the light at the end of the tunnel)!. That is where I am at at the moment & I am for sure still very much open to advice here. Thank you. RR EDIT & these CC 99121 locks have alot & I mean alot of "gap" between the "ends" up top that you dont want to be butted. Not sure if that is a good thing or not, with the gaps "even" on each side there is alot of clearance.