Wierd, my sled was way over oiling, I unhooked the pump linkage and ran premix and there was an extremely noticeable difference in low end response. Not a small difference, but a very noticeable, bog removing difference with my oil pump linkage unhooked and premix at 36:1 in my tank.
Maybe my sled likes running REALLY rich on oil, or maybe the cat pumps revert to idle oiling when unhooked?