As for me, I rotate mainly with carbohydrates, I only slightly add fats on low days, but I do it for offseason, while during preparation and cutting, the differences on low-high and non-training days are paradoxically much smaller than on off-season - it is dictated by the fact that the caloric plus this is the factor that worsens insulin importance the most, so I try to be on kcal deficit for at least 2 days off a week to prevent it from worsening. However, when cutting, we do not have to worry about sensitivity, but about maintaining as much muscles as possible and training parameters at the highest possible level.