Hi, i had some problems with my deck today and could solve it meanwhile.
look here for the Problem: - YouTube
It was the Pinch Roller!!
with an normal Tape i had much wow and flutter on side B and so i decided to get the Roller out and give him a nice clean with isopropanol and a rubber repairing Fluid for big Printers (such as Heidelberg), dont know the exact name of it.
for now it worked out but i think i have to get some new roller in Time.