The Killer Instinct (dependent on drill pattern) should handle more oil. I just drilled up a NIB V2 Sweet, that ball hates oil and loves friction. My V2 Sweet has the pin right below my middle finger with no void hole (5 inch pin to PAP). When the Killer Instinct begans to become too much ball for you, then I think you can switch to the V2 Sweet.

The V2 sweet turned out to be a surprisingly mild ball for many a bowler.  It is generally a remake of the original V2 pearl.  Having thrown both the sweet and the pearl with similar layouts, even though the pearl has 300 or so more games on it than the sweet, it was still 2-3 boards stronger.

I agree with Dyno-Joe's statement in general, especially if you drill the sweet to go a little longer (which you can do - the core will help give you some read in the midane) and the killer instinct a little shorter, you should have a nice 1-2 combination for medium-heavy to medium-light lanes.
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J.J. "Waterola Kid" Anderson, the bLowling King  : Kill the back row