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Put the AC on recirculate, max cool, high fan, any time you are forced to slow down. Keep the engine speed above 2k rpm and get free AC when you are in DFCO.
Engine is most INEFFICIENT when idling. If you can't force DFCO to get free AC, then the OP has it right, under load at peak efficiency, adding ac means the lowest consumption increase in fuel.
What is possibly more important is to make sure you get the most out of that cold air, which will come out for some time after the compressor is disengaged. High fan when running the compressor, low fan when not.
Always recirculate when running ac.
regards
mech
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