I'm considered to be a slightly speed dominate bowler, and because of this, I was wondering if there are certain drill layouts that are more likely to work well for better ball reaction.  And what about types of balls, rg, and surfaces for speed dominate bowlers?  Typically, I am about 14-15 mph at the pins, with low to lower medium revs.  Every ball I have now is pin under ring finger, and each ball is usually dull.