Hey Sean,
A couple of my buddies had PU's as well and they have also retired (sold) theirs.
I have had my delta for about almost 2 months now. We have similar PAP locations (see my profile). I have mine drilled up with the Pin Under bridge and the MB in the Strong Position (5 1/2 x 4MB) and a weight hole about 6 inches over.
Very angular backend shape and can handle its' fair share of oil.
Do a search on the Delta and you'll find some reviews on this ball.
I see this ball being sharper on the backend if drilled exactly the same as your Phenom Unleashed.
Hope this helps!
Regards, M.C. Rammer
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