Timing Curve on 360 in an RV

Now lets talk vacuum advance.
You have a program in your computer, that allows you to add timing to the base Power-Timing to compensate for OTHER THAN WOT throttle/load settings.
For example; while cruising , and still geared for 2400 at 50 mph, your engine might want a cruise timing of 48*/just guessing, to max the fuel-economy.
But your power timing, in the above example, is only allowing 23.4*.
The difference; 48 less 23.4=24.6, has to come from that program.
At 3200, your engine might like 54* of cruise-timing. Again the difference from the power-timing to what the engine wants, has to come from this "vacuum advance" program, whatever your computer calls it.
This also applies to Part Throttle operation.
Perhaps your engine in second gear,at 2800rpm, might want 50*/IDK, just guessing .The difference from the Power Curve to whatever it wants, has to come from this, adjusted for load, PT, timing program.
This increased low-load and PT timing, will allow you to lean the fuel out a bit, and simultaneously cause the engine to run cooler and make more PT torque.
I can't tell you how to program yours except to say 9* is a poke in the eye. Your engine will want something like 20 to 24* at cruise speed, whatever the manifold vacuum is at that time. And in first gear, it will want additional low-load timing beginning at about 1400 rpm, whatever the manifold vacuum is at that time.
Again, the operative phrase is; sneak up on it/ back it up if it detonates.