Re: steering
I'm guessing you have morse dual cable steering. The cables are out of step with each other in the helm.
The procedure is to correctly assemble the helm, then center it and hook up the cables at the motor. Many installers did it backward and wound up with the racks 1 or 2 teeth out of sync with each other. Boat may have been like that since new.
Easy to fix, but you may be turning the adjusting nuts on the add on steering tube quite a bit.
If cables are getting worn, or helm messed up, maybe now is the time to go for a dual cable NFB system. 4 turns lock to lock instead of 2, and NFB is real nice. Even if you get knocked off the helm, it isn't going to hook on you.
hope it helps
John