If you can get around the track at all with the GT3B and all it's lag, you'll be way more competitive with the 4PL. If you're still learning how to get around the track, it's probably the lag holding you back. Very, very hard to collect a slide or catch a roll when you don't know how long it will take for you to do so.

Or, let me put it this way, would you rather drive to work in a 1979 Ford Pinto that turns way after you've moved the steering wheel and brakes long after you've hit the brakes or a 2012 BMW?