Less speed,even one mile an hour,makes a pretty good difference. Also,since you weren't trying to throw with your normal speed or revs,you were more relaxed and the ball came off your hand easier than normal. Hence,more revs and what seemed to be a better shot,and it probably was.
Thing is,your middle finger by itself might not be able to handle the strain of a full league night of bowling and you would more than likely cause an injury to the finger or any of the associated muscles or tendons whch would cause you to miss some bowling.
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Chris
JTTDB---Just Throw The Damn Ball
Don't "think"---that ball isn't in your bag yet..........