I also haul 3 balls to any lane, plus a spare. Normally two balls as 1st choice and a backup, when the line becomes dry, plus an additional option as a fallback/plan C option when the lane is completely different than expected.
Favorites in my arsenal for heavier conditions when anything else fails is my 1.000 grit X-Factor Re-Loaded, and for easier conditions a 1.500 grit Vicious Attack. Both are drilled with pin above ring finger, CG dircetly below and MB to the right of the thumb hole for length on medium conditions. With this, both balls are very steady balls.
In the humid air of summer, lanes can really be tricky. In my Monday summer league during the last weeks, the lanes have been completely different from winter and spring time. I used to play heavy stuff like an Eliminator, but this is by far too much. I have got down to polished particle pearl and polished pearl raectives to create length. But through the course of the league, even these lighter balls burn up! Hell...
I just bought a used high RG polished pearl and had it drilled pin above bridge with CG in the palm as a length and control ball. First tests looked promising, but I struggle with humidity, too. I also bought a Urethane ball as a new final fallback option for (too) grippy backend and toasted heads.
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DizzyFugu --- Reporting from Germany
Team "X": http://homepage.mac.com/timlinked/
"All that we see or seem, is but a dream within a dream..." - Edgar Allen Poe