Slowing down a stock setup (titans in series??)

Still Digging!!
Sorry to read about your luck with a suitable site Daf, There is always someone ready to spoil the fun. Have you tried any industrial sites (noise is less of an issue) Good luck
anyways back on topic
I have a TXT with my old stock Titans and EVX , It is running on 12 cells with 9tooth pinions.....Its still too fast. I have tried running on 6 cells with a link across one batt input, but it seems to lack the torque it had before.
Will wiring the motors in series keep the speed the same as on 6 cells but with better tourque??
many thanks
steve