Raven,
I like the GP2 above the 5.0. Usually when someone gets a GP2 they want it for a flood and I suggest to them to lay it out for that condition. Place the pin in the leverage position 3 3/8 from PAP (or a tad further like 3 5/8 from PAP) and place the MB on their VAL. This will get it started up very early for heavier oil.....and most are suprised at the backend reaction they get out of this ball when it is used on the proper amount of oil.
For underneath the 5.0 there are several options....Since the 5.0 gives you good reaction off of fresh backends or even mild carrydown backends.....then how about a ball to smoothen the lane down a bit like a Slash? With the proper surface adjustment it gets down the lane easier than the 5.0 when the mids start to go. Another addition I think would fit great is the Xception. Imagine an identical reaction to what your 5.0 gives you, but the Xception clears the heads and mids much easier! Overall you will see the Xception about 5-7 boards weaker or more, depending on the condition you are bowling on.
-EX-
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C-G Pro Shop (owner/operator)
Youngstown Ohio
Track Intl.-Amateur/Pro Shop Staff
www.trackbowling.com