Stock settings have too much preload for someone 150lbs in my opinion. I'm 210 and I backed it off front and rear to get the sag right. I target about 30% of total travel.
Setting sag isn't complicated. You can do a google search, and in 15 min of reading understand how and why to do it. Then you can tinker productively instead of randomly :-)
I would set sag properly before messing around with damping. At 210 I have preload in the rear on third setting (from the softest) and front 8 turns out. I increased damping a bit at both ends as well but would have to check my notes in the garage.
Good choice on the garage. Mine is a toy box for man toys. The cars stay outside, rain snow whatever.
'79 Yamaha XS650