Hey El Pirata - Well, in the end I hope we can all agree to disagree bro. Yes, you'll c some power gain but I've seen some substantially shortened engine life on different engines over the years. For my tastes, the cons don't outweigh the pros on some engines. And of course my engines are always properly tuned.
Pkg2003 - That's a mean ass engine dude with a torque curve that drops right off in the middle. It's got ALLOT of low and mid range power. It's no female pee pee in the top end department either but mid and low end is where it shines. I've never run the Violator but I bet it's a beast with that engine. If you wanna try 30%, I would definitley try a mid-range plug like an O.S. #8 like El Pirata, that or something even cooler.
Edit - I've never tried foxplus like the above poster reco'd buy I've heard many good things about them.
Peace