Having the pleasure of bowling 3rd, 4th or 5th squads at many tournaments (without fresh oil), a tip that has helped me was one from some local greats (Brad Angelo, Fran Bax and Bruce Heim).
In my setup I start with my hand in the "suitcase position" or so that the thumb is at 10 o'clock and the fingers at 3 o'clock (right hander). Then maintain that position throughout the swing and release. This has allowed me to get through the heads cleaner, good length, and tamer back-ends.
It took me quite awhile to be comfortable with it, but is now a part of my game for certain conditions. Also found out that this works well with "flying backends" such as the PBA "A" pattern when the lanes have the backends stripped.
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