They are z-spin balls. drill them accordingly. Most likely, the mass bias/psa/high rg, will be 6-3/4" at 90* from the V mark and the pin. If you have access to a DeTerminator, spin them up to find the PSA's. If not, you are gonna need Jason's advice.
The pearl that is pictured, is a strong drilling. I would drill it like that one.
My Crossover has the pin above the ring finger and the cg kicked right 35 degrees. I rolls well with a smooth arc to the pocket, but still gets that good Visionary carry. Keep the Crossover clean, because they tend to soak up oil.
The Spartan is one that really needs the determinator. Or drill it like the MB Pearl.
Roll them BEFORE adding any wt. holes. You may want one ball stronger, and another weaker.
Hope this helps.
Scotts33 spins all his up and knows where the psa's are located.
If you didn't like that strike, just watch this one!