Well you could save some time and money ,if you can live with the bike the way it's running,for next few weeks.  The stock jets 52,5 pilot 147 main are lean for anyone but those living at about 4000 ft (the Rockies)  for your elevations @ 800ft - OHIO- I would say 52.5p-150 m -3 washers for the spacer,    FLA @ 100ft-55 p- 152.5/155m - 2washers for the spacer, and retune the fuel screw after any /all changes.Your pipe isn't turning very blue ,the PO may well have put in larger jets when he changed to the Dyna muffler, this would provide a good idle and fairly strong running at 3/4 to wide open throttle ,but he might not been aware of the need to do the spacer mod ,which adds fuel at the speeds your feeling the sag (part throttle ( 1/4 to 3/4) /normal driving speeds- were your throttle spends most of it's time).