Good decision. I had a 70# 24v 5 speed on a 17.5' alum Tracker. I hated that thing, it was just too fast. I couldn't slow it down. Yes you can have too much TM. I switched to a 12v 55# variable speed and am much happier. The 70v would have probably worked out if it were a variable speed but the 70# was just to much for that boat. No way I could run it on high it would have tore itself off the bow.