Look guys I just had this thing installed about a month ago, don't drive it much, just finished putting my 500 miles on it today, the problem I have, and it just started happening is taking off in first gear, if I'm the first in line at a light, I can jump out and take off with no problems, but if theres alot of SLOW (you know the type, not in a hurry at all) people in front of me, and I have to feather the clutch out, it starts jumping around and vibrating real bad, it sounds like something is banging against the floorboard, but once it ingages its back to normal, and with city driving its almost imposible to get first in line at the light all the time, is this just a sacrifice that I have to deal with since its a performance clutch, or should I have better driveability with this thing, I had this thing profesionally installed, but thats not saying much, I'm begining to think the shop that I took it to is a joke, but thats another story. so what do you guys think? is it just not seated in yet, and will fix itself soon, or is it toast? I haven't ragged on it yet at all, but this thing gets pretty imbarassing at take off, I guess to an outsider it would be like I can't drive this thing

any sugestions would be appreciated. oh and it's not slipping either, and first is the only time this happens. I guess it would help to tell you the car is a 2002 WS6, with 30,000 miles on it, other than that I was in love with the characteristics of this clutch, now its like a love hate relationship.