Timing Curve on 360 in an RV

What stall, rear gear, and tire roll-out? this will play an important roll in avoiding detonation on a long pull. Detonation and it's sometime partner pre-ignition, is the enemy of your engine, and has to be avoided at all costs. They break things like pistons and rings and hammer out bearings.
I'm trying figure out why you would chose all-in at 2200; and no vacuum advance. That is a race-car tune, with a lightweight car, a big engine, and race gears.

For you tho;
For fuel-economy reasons, as well as a bit of WOT power;
you will need to push the minimum cooling system temp up to at least 180*, Myself; I would try for 195. But your cooling system will have to be rock-steady without any hunting around. You will have to make it so. You cannot begin your tune until the cooling system is at a fixed and steady temperature; whether it be 195 or 180, or whatever it is; it has to remain stable for the tune. Later you can add temperature compensation.
And your engine will HAVE to have a source of fresh cold air. If the inlet air temp is bopping up and down, from 100* to 400*F you will have a big tuning headache.
Ok so, you should know that the more idle timing you give it, with no other changes, the higher the idle will climb. This is not necessarily a good thing. Your automatic transmission equipped engine will never be asked to pull at idle, so at the beginning of your tuning, it can be whatever. Later, much later, you can start to monkey with that. So, your engine doesn't much care about it's idle timing, as long as throttle response doesn't fall on it's face between idle and it's stallspeed. But beginning at the stall speed is where it starts to care. From there to ~3200 it is almost critical to not have too much, and after 3600 most engines fall to between 32* and 36*.
So,
Confirm your timing index mark.
reset the idle timing to 10 degrees advance.
reset your idle rpm to 600 in Neutral, or 550 in gear whichever is less.That stock engine should idle down to 600in gear, no problem.
Now increase your idle timing to 12/14* and leave it there.
Now program your computer with a linear power-curve to be 26* at 2800; and then change to a slower linear curve to be 34* all in at 3600. That is your starter POWER CURVE. It will only be near-correct at WOT. It will not be correct at any other throttle/load setting. I repeat; it will not be near-correct at any other throttle/load setting except WOT.
All other throttle settings and rpms are adjusted by the load sensor, AKA the vacuum advance. This timing is added to the power curve in direct proportion to manifold vacuum, which is 100%dependent on the load factor or throttle opening versus rpm, AKA speed-density.
So lets say you are cruising along at 50 mph in top gear at 2400 rpm. Your engine might like 56* of timing there; IDK, just saying. But if you give it any throttle there as in; you came to the bottom of a kill,then, at 56* and 2400rpm, it will only take a few seconds (15 seconds@2400rpm is 600 revolutions times 4 firings per revolution is 2400 hammer-blows, or 300 per piston)until the factory pistons may begin to fail; IDK how much they can take, but the rod bearings may fail first. Therefore,the "vacuum advance" will have to immediately start to decrease linearly with throttle opening (manifold vacuum), back to the power-timing,which might be 20/22*@2400( just guessing) which I purposely made weak for this reason. Once climbing up that hill, your "vacuum advance" will have to stay at zero, while the engine is stuck in top gear at 2400rpm, on the SAFE power-curve.
If you were to downshift,at this moment, with a 727, the Rs would jump from 2400 to ~4100, and the engine would be on the all-in timing of 34*@3600, and if you have sufficiently enough octane rating, it will pull itself along nicely. Perhaps nicely enough that manifold vacuum might rise high enough to again bring in some "vacuum advance". This might be a good thing but could just as easily be bad; that is for YOU the operator and tuner, to determine. To help you with this, your EFI may have a knock-sensor tune available, and I highly recommend that you use it.

So some of these things have already been mentioned, I just put them all in the same post, and added some reasons why, to help you understand.
Current thermostat is 185, keeps operating temp pretty steady on a hot day between 195-205, depending on if I'm in stop/go traffic or on the highway.

For the timing curve, the EFI system has the following parameters to set:
Idle timing - Sounds like I should set this to 15-16 degrees (aka initial timing)
Advance start (rpms) - Tells system when to begin the advance curve, currently at 1200 rpms
Total timing (degrees) - Sounds like I should set this to either 26 or 34 degrees (this will be max timing)
Total timing (rpms) - Sounds like I should set this to either 2800 or 3600 (this is the 'all in at' setting)
and Vacuum Advance - Not sure what to set this to, maybe 5 degrees (fyi - doesn't affect idle timing)

I didn't follow the "start with setting your curve at 26* at 2800, and then change it to be these other settings." Why do one and then the other?