Without knowing much about the way the ball was drilled out, the lane conditions you normally bowl on, your style of bowling, PAP and so forth, I'm going to hazard a guess that the oil machine laid out a little more oil than normal, forcing you to slow your ball speed down in order to get any hooking action out of your Throttle-R. Sanding the ball would help the ball grab the lane quicker and possibly give you a couple boards more hook, but ultimately in heavy oil you won't get a strong hooking reaction, expect more of a controlled arc.

Matt