Need some help with my timing curve.

Map out what your vacuum advance is doing also if you can. There is mileage to gain. It might like 45 or so degrees at cruise. And you might try to bump one or two degrees in to the top as mattax suggested just to see if it likes it and differs from dyno to car. Oh and get a new set of plugs, rip it once, shut it off and pull em. Let’s see what the timing mark and fueling look like.