I find the SMG II to be great on the track.
You need to do a slightly lift as you shift to smooth it out. But then again, you should not be shifting unless the car is pretty much in a straight line anyway.
But if you want it to shift slower, select a lower setting than S5.
BTW I instruct in various HPDE events.
'95 Alpine M3 LTW
'00 Dakar M Roadster
'02 Topaz M3
Red/White SRF #4 (Chassis 561)