Kyle,
In response to your second question (why you may have a low track):
Often times when a bowler spins the ball it is because even though he/she may have a perfectly straight arm throughout the swing and with a nice firm wrist behind the ball, however, at the release point and follow-thru the elbow just goes slightly outside of the body, causing the hand to rotate slightly too early and a bit too much around the ball.
Not ever having watched you bowl, naturally, I can't say for sure that this is what you do. I wouldn't worry too much about your ball's track; as long as your concentrate on accuracy (with smart lane-reading), and staying smooth throughout your approach and delivery, you'll be consistent.
I used to spin the ball, now I have a very high track, and I've been able to accomplish this by staying slow with my feet, getting down at the foul line, riveting my eyes on my "spot", and following thru like a maniac, but at the same time staying down with the shot, and watching my ball cross its intended path before allowing my body to get up. In the beginning my body had a hard time accepting this technique, but it soon became natural, and my game forever improved. Mechanics, mechanics, mechanics, and lane smarts!
One more thing: relax your arm.
Regards,
BowlingWolf