If you want my opinion...(which most people don't lol)
The key to developing a strong spare game is to
1) Making your SINGLE PIN SPARES
1a)Learn to FLATTEN YOUR WRIST to shoot corner spares, save the 60 or 70 bucks you WASTE on a spare ball <~~~~This alone raised my average 8 pins from 2002-2003, and 4 from 2003-2004.
2) then work on your multiple pin spares
3) have at least 2 ways of shooting spares.
for instance, I generally shoot right handed corner spares off the left edge. If there's too much oil for the ball to go through, I can go cross-lane without a problem. Some people prefer to go straight at spare, but I like an angle, I feel I can get a better margin of error that way.
Tenpin2002 will tell you that I'm arguably the BEST spare shooter in a league, where I averaged 208, high man was 222, and there were 6 guys between 208 and 222. I'm the one who argues with him, because I'm not satisfied with 95%.
ALWAYS PROUD, NEVER SATISFIED
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Carry the 8. be a good lefty.