I want to make sure every ball feels the same, Doesn't matter if its a spare ball or my Ambush, I want them all to feel alike. Span, grip, everything. Because I have been known to use the spare ball as a strike ball on harsh dry conditions.
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Brian
Northside Pro Shop Staff

It's got to be the same for me, or it just doesn't feel the same when it comes down to throwing at that damn 10 pin

I can't imagine why someone would want a different "feel" when picking up a spare ball.  The whole idea of a plastic ball for spares is that you can use your "normal" release and cover fewer boards (i.e. go straighter) due to the low friction coverstock.  A different span/pitches (in my opinion) in your spare ball would result in releasing it differently, therefore introducing some unneccessary inconsistancies into your game.  If you like a shorter, more relaxed span or more reverse/forward in your thumb pitch or whatever, fine, but do it to all of your equipment, not just a spare ball.

S^2
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The perfect qb/receiver combo in Miami:
Ginn & Juice
(Ted Ginn Jr and Cleo Lemon)