Hey Solid 9,
That sounds good, I have my pin in the same position but I placed my MB past my val at 2.75 inches, this makes it stand up a little faster but remain very smooth throughout the lane with a very strong continuous arc. If you want it for med/heavy, you may not need to touch the cover yet, Excaliber, Aus Leftie, and myself had this ball moving quite a bit. If it doesn't respond as strong as you want, then take the surface down some to accommodate your oil thickness. Hope this helps...good luck.
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Rick Leong
Ten Pins Pro Shop
Track Pro Shop Staff
Vise Grip Staff