FiTech EFI system

I would watch your map numbers at the time you get that lean issue when getting back on it.. You may be at the point where fuel is being shut off. DFCO cut fuel map
If you are, then try lowering the dfco number to slightly less than what the MAP numbers say. Bring the DFCO return map just above the number you set the DFCO Cut fuel map to.
There is also the DFCO return fuel setting to consider

Ken