Fixing with equipment.....
It is my experience that you need to use an aggressive layout (near max leverage) but keep the pin higher to help move the bowtie up.
Hopefully you are able to place the weighthole in a flare increasing position to help move the bowtie and track even further. Brunswick drill sheets are known for more info on flare increasing holes.
Choosing ball specs with higher top weight will also help as will using pins over 2".
Fixing with release....
Most likely he will need to change his release to add more tilt to the ball. See if you can get him to put more of the ball on his index finger all of teh way through his swing and release. Can also change pitches in the grip to help but he will need to get used to them since the new grip will feel different.
Best of luck!!!!
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Doug Sterner
Doug's Pro Shop
Owego, NY
http://dougsproshop@aol.com
www.dougsproshop.net
Lane 1 Buzzsaw...The Official Power Tool Of Bowling