Hey Brian,
With the lower track, I'd suggest going with a stronger cover like the Untamed to overpower the carrydown. Carrydown appears when we don't have enough surface on the backend to react. Therefore, by changing to a stronger ball which can hook thru that carrydown, it should make the shot look more normal. I also agree with Ex on drilling for more length and a strong backend. Based on your info, I'd go with a pin around 3 7/8 to 4 with the mass bias in a strong position as well. We don't need the ball to roll early, we'd like to have it finish harder in the backend, hence having the mb in a strong position. Hope this helps...
--------------------
Rick Leong
Ten Pins Pro Shop
Track Intl. - Amateur/Pro Shop Staff
Vise Inserts Staff