Previous owner was heavy..Should I reset them?
I would experiment with each setting to see how the bike rides and handles. For me riding solo on position 3 results in almost no laden sag and there should be some. The change in ride height is between position 1 and 3 is very noticeable.
The riders handbook states:
Position 1 for solo riding
Position 2 for passenger or heavy load
Position 3 for maximum load (I take that to mean carrying 425 lbs)
I always ride solo on position 1 and increase pre-load when caryying a pillion. It's needed because on the one occasion I forgot the shocks bottomed out on severe bumps.