Your motor slow start speed problems sound battery related ....possibly voltage sag due to high initial current draw.
Could you nick a battery from one of your heavies ...add a temp lash up ..and just see if that cures your prob?

Edit ...Do you have the same prob with both sets of batts ....the old 7.2v and the new 8.4v ones?



(Message edited by woody on July 17, 2007)