You could also try the rapid IMU realign procedure:
Maneuver to 0,0,0 on the GDC FDAI
V41N20E, E,E,E (coarse align to 0,0,0)
V40N20E (fine align; NO ATT lt off)
V25N07E
76E, 40000E, 1E (set DRIFT flag)
V25E
77E, 10000E, 1E (set REFSMMAT flag)
Do a P52 option 3 (Note that auto optics may be off quite a bit and torquing angles may be high, especially in roll. No problem as long as the star angle difference is okay.)
GDC align to IMU
how can i null all my rates to 0 with the CMC, i want to get the CSM as still as possible?
SC CONT - CMC
CMC MODE - HOLD
You should also check the deadband and rates in V48. You'll get the tightest deadband with narrow deadband and lowest rate setting (XXX00 in R2 of N46).