TDC57,
Have you tried spraying it off between games?
The other thing I'd try between the oil extraction is to wake up the surface often. Because these respond slower to friction, when those (microscopic) peaks and valleys smooth out, the ball may "skate" and be too slow getting to the hook and roll phases of ball motion.
That surface texture on any reactive ball changes very fast, especially when used close to friction; it's just that typical reactive resin balls respond faster to friction so the change isn't quite as noticeable. On the other hand, that's exactly why we like the BTU idea. Urethane-like reaction without it being urethane.
Before league, hit it with an abrasive pad, even by hand, and see if the ball picks up earlier, which I suspect is the real problem. Oil absorption happens, but typically not as fast as you seem to be experiencing. I believe some surface texture will allow the ball to displace the oil more efficiently. You're a lefty, which usually means less traffic, so your typical friction takes a little longer to develop than the right side, which can get toasty with several bowlers... Let me know if this helps, and best of luck to you.