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I've never given it the level of thought shown in your post, but I flight plan 26 gph total in my P337H. That's at 75% where I usually get pretty close to the book cruise numbers. Close enough anyway.
I do not have GAMIs.
I fly pretty much the way you described: I set FF via the JPI to about 13 GPH each initially, then "diddle" with it as the flight progresses. The JPI has a "Lean Find" feature that I find very un-intuitive, so I hardly ever use it. I will lean back as I get to altitude if I can keep my CHTs under about 380 and turbine inlet temps under 1500.
I just had the baffling repaired on the rear engine and haven't yet made any flights of consequence, but before I had to give the rear a bit more fuel in order to maintain the same CHTs. I would often fly with FF of 12.5 up front and 13.5 for the rear. We will have to see if the baffling fixes change that.
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