the 10° came about because of instances of the 7° pulling through. i've used 10s without incident but one thing i can say is that there's always been a burr on the valve lock groove upon disassembly, the 10s simply don't wedge as tight due to the angle. afaik the super 7s are the best setup going these days. imho before condemning the locks make sure there aren't other valvetrain issues. i'm willing to bet when it comes to parts such as locks, springs, retainers etc. there aren't a lot of different manufactures making them. most are probably coming from the same (few) sources then labeled by the sellers as their own so don't think just because you buy them from a different company you're getting a different part. 2¢