Have you tried either 4000 or 2000 with no polish?
If you have and still haven't gotten the results you're looking for it could be for a few reasons...
Your release... did you ever have a Black Widow that made that sort of motion, or are you watching others throw their BW's and wishing you could get the same reaction?
Oil pattern... This ball and almost every ball that MoRich puts out handles oil well and needs oil in the heads to retain energy.
With these super strong asymmetric cores that Mo Pinel has been creating, I've seen the need to use higher and higher pin positions to create the flip you're looking for. Your layout isn't one I'd see making that sort of motion change on medium oil.
If your PAP is 4 3/8 over you're looking at a pin placement on that ball that currently is in a strong position. I'm guessing that for you it's roughly a 35*x4.5"x45* dual angle layout.
I'd rather have the ball at 70*x5"x20* to get the motion you're looking for. If you're not familiar with the dual angle layout method, that layout would put the pin higher above your middle finger and the MB pretty much in your thumb.
Maybe I'll layout an Ultra Zone like that for myself...
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"A word to the wise ain't necessary -- it's the stupid ones that need the advice." Bill Cosby
"Never argue with an idiot. They bring you down to their level and beat you with experience."