im a bit of a superstious guy - once i have a buggy dialed in its too much work to get a new one and do the same. id rather focus on driving.
i know what you mean, i have 2 mugens, both set up identical, yet they handle differently, i get slightly faster times with one than the other. they're both fast buggies, i wonder if it's all just in the mind? i'm guessing there's something not quite right with one of them though.