I have a 2011, 1675 impact sport. I went from a 12v to a 24v 60″ shaft 80# Terrova I-Pilot link. The 60 inch shaft is really helpful in any wave action that gets the boat bobbing up and down. Most functions work better with the main motor skeg in the water. The spot lock works better when the shaft is down and the TM wake clears the hull.
I mainly fish into the wind generally with two people sitting at bow (my boat has the three deck plates for pedestals). When someone moves or gets down the boat will not continue straight. Have to adjust the steering of trolling motor. No issues with motor coming out of water.
With you having the Terrova I assume you upgraded? Mine has Powerdrive V2 2011 model. Someone suggested getting new motor and I think I will look into purchasing one. Do you any additional weight up front (like sandbags)?