No, there's no difference between different +4 settings. The difference is that you're using the F1 GTR, which isn't anywhere near as powerful as the R390, the Panoz, or the CLK. Because we adjust settings after entering the race, the opponents are based on the car's stock specifications, so non-Mclaren drivers get faster fields.
You guys are noticing something about GT4 that becomes very obvious when you do races over and over again: in the same car against the same field, the AI will behave the same way every time, right down to spinouts. The AI isn't scripted, but they're programmed to react in particular ways to particular "stimuli," and when there are no differences in those stimuli, they epitomize predictability.
I haven't tried the race yet; I've been too wrapped up in the FGT championship, which I'm doing in the 787B. Later, I'll do some particular races in cars like the Suzuki Escudo and the F1 GTR, which should be fun (and yes, they can be won).
You guys are noticing something about GT4 that becomes very obvious when you do races over and over again: in the same car against the same field, the AI will behave the same way every time, right down to spinouts. The AI isn't scripted, but they're programmed to react in particular ways to particular "stimuli," and when there are no differences in those stimuli, they epitomize predictability.
I haven't tried the race yet; I've been too wrapped up in the FGT championship, which I'm doing in the 787B. Later, I'll do some particular races in cars like the Suzuki Escudo and the F1 GTR, which should be fun (and yes, they can be won).