The ring finger is recognized as the finger that creates rotation.
To reduce the revolutions (and reduce hook and/or backend),
some highly skilled players use this grip. The grip is a combination finger-tip
 and conventional in that the  middle finger is drilled as a finger-tip
span, with the ring finger drilled conventionally. This reduces the leverage
and power generated, which reduces the rev rate and hook on the lane.
This grip works best for players of a higher skill level. Consistency for 
release,hand position,ball speed,revs and accuracy is a must to successfully
utilize this release. 

Long oil has been applied to a distance of more than 45 feet down the lane.
Short oil has been applied to a distance of 35 feet or less.
Long oil means your ball has a shorter distance to react on the dry backend before it
reaches the pins. Short oil means your ball has more room to hook.

For more speed in today’s bowling go to a lighter ball,
don’t try to increase speed by increasing back swing.

What do you think about usbc?

Full-roller is not the best ball for the lane surfaces of today
3/4 roll is much more effective in today’s game.