I'm a bit interested on shifting with an aftermarket clutch myself
With the stock clutch, I could slip it perfectly, and could even shift fast and smoothly enough on 1-2, and 2-3 that it was hard to tell I even shifted, no loss of power between shifts at all. After I burnt the clutch up (ehhh, it was starting to go anyway), I put on a ACT street clutch (never forgive myself for that one!). With 350 miles on the clutch, decided it was time to make my first trip to the drag strip. I hadn't yet mastered the launching with the new clutch, because it's such a firm engagement, it's difficult to slip. What I round I really disliked, was that going down the track, each time I shifted, I would bog for 1/2 second, then take off. Even one of the guys watching me made a comment how I would take off really fast, then see the car pause for a second as I had shifted and bogged, then would go blazing again. Of course, on my 5th pass, I blew 2nd, and still waiting on my RA gears. I tried staying in the throttle (have UTEC with launch controller), it would do it. Tried getting out of the gas, and then getting back into it as I left off the clutch, same difference. My launches were pretty bad too, having a difficult time slipping it and wasn't willing to dump it. Most of the time I would just end up bogging down. I'm hoping that with the clutch broken in more, it will be a lot easier to slip on launch and shifts won't be so rough. Oh well, won't really get to know what she'll fun until next racing season, track closes in 6 weeks, and I won't have my gears in for at least 3 weeks, need time to break in the clutch more and the new gears.