Special Agent (depending on how it is drilled) would be a bit more friction than your Black Widow.
If you thought of polishing the Special Agent why not just get an Agent? Same core - Pearl Reactive cover should get you where you want to go a bit easier.
However, if I were you I'd go with the recommendation you are getting from the majority of this thread - go get a Shift. Besides the fact that you will get a ball for your intended target ( below the BW, above a Spit Fire) you will also get something else you are not asking for - a good over / under ball. The Shift will smooth out a wet/dry transition better than both the BW and the Spit Fire. Also, the Shift is a good ball for carrydown.
Edited on 3/26/2007 3:20 PM