I have a Spectrum SD45 DCC onboard that runs very slow.  I have tried to reconfigure the max speed "CV", but this has not helped.  The loco will only pull 3 cars up a moderate grade.  Does anyone have any ideas to get it to run faster, pull more?  I am using an NCE Power Cab system.  My other locos run fine.  This is my second attempt to post this, I hope I haven't repeated myself.

Thanks,  Dave