Having not thrown the PA, and just thinking of current line ups. The PA was supposed to be longer version of the Paranormal.
The Guru is the most hooking ball in Radical's line up as of now. And I am not certain how much time it would actually see on a week to week THS.
I would steer more toward the Reav V2 or V2 Pearl, if we are talking the Radical line. The solid V2 has been a great ball for me, one of only a few that I can use all three games on a THS, just move in and watch it come back without burning out.
If you are just looking for pure hook, the Guru is the way to go. I am telling you, the Guru is impressive.
However, Newguy would be the one to provide the best advice on this forum. If you get a response from him, count it as golden.
My suggestion would be to post on the Radical topic page and see if you get any better responses.
Another forum more geared toward Radical heads is bowlingchat.net I believe. Sorry, I hate to give other forums out, but want to give the best advice I can.