I've seen bowlers with tracks that run over both inserts but be almost 3 1/2 inches from the thumb. My team mate did that for nearly half of last season. But he is finally leveling out and he now has a pap of 4 1/2. mine has changed as well from the begining, i started at 4 1/2, to now 4 7/8 and 1 inch up.
After seeing the same type of lane conditions and making changes over the season in pitching and spans, i was not surprised to see my axis point changing.
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Visionary bowler, I see the future!
Tim Thompson, Visionary Bowling Products Proshop staff For Canada.