I have not personally tried using different pitches in my spare and strike balls.  However, I do recall reading an article about Chris Barnes which included his specs for both strike and spare balls.  He actually uses more reverse thumb pitch in his spare ball.  It appears that he wants to get a quicker release and less rotation so that the spare ball rolls more end-over-end.

Thanks for the replies folks. Sorry I haven't posted back in the last couple of days but have been too busy "workin for the man"....lol. If there is one thing that I am weak in as far as bowling goes, it is drillings, layouts, and pitches. But hey that's why I pay you guys the big bucks...right? Seriously, I have been trying to learn and sponge everything I can in these areas for a few months now, and it seems that unless you are working in a pro shop it is hard to pick up. I am a machinist by trade and I know that really the only way to learn is pretty much hands on. Seems most trades are like that, you just have to find someone that has experience and patience to learn from.

 As far as the spare ball goes I may just try it. Like I said earlier, I make most of them but till I can get 426/428 like WRW last year there is room for improvement. I will throw out the two single pin spares he missed last year as operater error, or maybe he just stuck at the line...lol.

 Actually Precision, I am glad you were long winded as I learned and opened up the noggin' a little because of your post. You know the old saying about "teaching a man to fish"...  I guess I was a little afraid of change as well as not wanting to mess up a good thing. However, I am a perfectionist and I am working on my game so much the last 2 years, I do not like giving away sticks. Again, thanks for the replies and keep them coming!