what the system says is fine. getting your motor to actually pull that gearing is the problem. i had a t4 with the novak 5800 and it was not even close to those speeds. i would say 37-38 on 7 cells.
http://www.teamnovak.com/Download/ac...pecgearing.pdf look at the bottom, also that is based on 6 cells, for 7 you should gear even lower.