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The transition from P1 to P1/S is a moving target - it shifts because the CalcLLOAD value has atmospheric modifiers.
When you have your fuel mapping set up correctly, you will find there will suddenly be "lumps" at the new transition point because of the incorrect ratio.
You will see swings of more than a full AFR point that will move up and down in RPM based on the IAT/BARO/ECT.
They will occasionally occur at full load, especially immediately following (within 3 minutes) a hot re-start.
I played around with a bunch of different combos and got tired of watching that transition move and lean-out because the PCM didn't understand the injector ratio.