For what it's worth we run the race empi 934's on the 10 car with good success. Use to run the baller ones but it's easier and slightly cheaper to just replace the empi's more often than inspecting and rebuilding the nice ones. We also didn't use to clock them but now do because someone who has been doing this a long time told us to. I could careless because my buddy always does the CV's lol.
might as update this for the fucked up CV i pulled out. star started chipping and took out my cage. even light pitting starting on the star, probably from the chips rolling around in there fucking shit up. other 3 CV's were tits
doesnt answer why CV's still click over 25* but im thinking its a combo of the CV balls (ha, balls) hitting the boot flange and each end that is extending outward of the CV not extending the same amount.