hey nocarey,
What is your PAP. Sorry but, without knowing your PAP, those nice pictures and explanations (with regards to your thumb and finger holes) simply have no meaning.
blackjack,
What is yours? Also your rev rate, speed, rotation? You should tell us more about your game if you want proper answers. One ball can be good medium ball for my style where it would be a dart and suitable for drier conditions for another.
Generally, for THS
Oil:
I'd go with Maxxx Zone. I'd adjust the surface around 2000 abralon for stronger releases.
Medium:
For stronger style, I'd suggest Rattler or polished Copperhead
For weaker hands, Ultra or Wild Ride drilled STRONG would be my choice
Dry:
Avalanche Slide
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Regards,
Natal