The Mammoth was a heavy load particle cover so that may have been the issue more than the layout in my opinion.
To answer your question, no, I don't think that a 5" pin to PAP would be too much. The ball gets easy length, though, so you may even consider going
4 - 4 1/2" from PAP as your profile suggests better than average ball speed, unless you're seeing plenty of dry on the lanes. Good luck.
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Lane Carter, Strike Zone Pro Shops - Salt Lake City, Utah
Brunswick Amateur Staff
www.brunswickbowling.com