Chris, nice to see you on the boards. I was just reminiscing about the old days playing video games at Dave and Busters.
Anyway I have the same problem as you. It seems to get progressivly worse the colder it gets. It could be one of two things. The crappy shifter forks in the trans or the fluid. I have Redline MT90 in there now, which still does not help, but will be switching to Redline D4 ATF. Apprantely the ATF helps with the notchy shifting.
If that dosen't work I guess I'll be looking into shifter forks in the near future.