Sorry you're still struggling with this!
Everybody is different. I'd suggest taking about ten days and eating nothing but animal and plant and see if your acne goes away. For most, I really think it's dairy, bad oils, or low vitamin D. For some, even eggs can be a problem. But you've already eliminated all those, it seems!
Seriously invest in making your own tallow from grass-fed cows. If there's ONE source of fat besides coconut oil that I can virtually guarantee has no worsening effect for acne, it's tallow.
Eating once a day definitely keeps my skin clearer than otherwise, but I haven't controlled the variables and tried different macros. I almost always eat 60% to 80% fat, 35% to 15% protein, and 5% carbs, except on the occasional carb-up period or family dinner, etc.
I drink little alcohol at all. Just kombucha, which has only traces of alcohol. I definitely have clearer skin when I OD on green tea.
Pics might help. Is this cystic acne? What type of acne do you have?
Steak, eggs, potatoes - fruits, nuts, berries and forage. Coconut milk and potent herbs and spices. Tea instead of coffee now and teeny amounts of kelp daily. Let's see how this does! Not really had dairy much, and gut seems better for it.