Based on what you have given I think you are on the right track with the WS, I would look towards a smaller VAL angle (maybe like 40*). Keeping the pin up will help it respond to what friction is down the lane, and then a larger second angle will keep it more continuous.
Another thought in the Brunswick family would be the Hellraiser. From my experience that cover seems to handle a little downlane puddle a bit better than the WS. Both balls are good though and should work for what you're looking for. One thing to always remember is drilling is just a small piece of the puzzle, picking the right cover/core combo is 75%. You're on the right track though going Asymm, just make sure you keep it continuous off of the friction so you don't start plackin' 10s.
Good luck!
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