I had this problem when I took my TC5 for it's first drive. The car felt so loose that it was difficult to keep it under conrol on the straights. Luckily it was easy to fix. I adjust doop to one mm. in the front and two mm. in the rear. Give that a try. Make sure that your droop and spring rate are the same left to right; this is very important. Droop is often overlooked yet it has a dramatic effect on car handling.