Ah, I am not familiar with those. The ones my granddad has might as well be tossed in the garbage. Haha. Along with the Falkens on another one of his cars, and the Goodyears on another. I'm surprised you still had traction problems with them if they're stickier than a 555. My 555s hold up pretty darn well as long as it's 60+ outside, and as long as I don't just stab the throttle. I don't know exact power levels I was at, but I was trapping just a tick under 120 in the 1/4 last time I was at the track, which would indicate in the 400-425 area.
Your car is an '01, right? I wouldn't bother with a J-mod on those cars either (they pretty much come with it already done from the factory), but it's worthwhile on the 99-00s, and downright required on 98-downs. It made the shifts on my car MUCH better, but didn't add any harshness at all.