Use 7* locks with that cam - no problem !!! I use 7* locks with a .600 roller!

The 7* locks actually provide more clamping pressure than the 10's. The point of 10's is they're less likely to pull through the retainer with high spring pressures - which you don't have to worry about with that cam.

Now on a totally self-serving note ... I have a brand new set of retainers that will fit your application. PM me if you're interested.