Our 1991 has the original smooth operating Edson steering system. Sounds like a restriction somewhere. One spot to check is in front (bow side) of the lower battery box where the cable enters the turning block. Someone pushed the box against the plastic guide and broke it. Open the small lower hatch to check it with a bright light. I replaced both of our broken ones.
If those are okay, disconnect the cable system from the quadrant and have someone spin the wheel while you watch below. That will isolate the system from the rudder and quadrant. I lubricate our system and inspect it every year or so.