I purchased a boat 15 ft fishing boat, and had to build a transom form just about nothing. All that was there was a small amount of original transom. I built the transom from scratch so to speak and from the looks of it ,it turned out ok. Question is this. When i mounted the motor on the transom, i knew something wasn't right. The steering cable was at an angle to the motor,which put the steering in a bind. I'm thinking the transom needs to be cut to allow for the motor to set in water the right way. What is the best way to determine how low i should cut the transom down.