Hey man, just keep experimenting whilst not becoming too obsessed, try to keep it balanced, easier said than done i know. Hopefully eventually you will find the answer. Personally i have allowed acne to control my life when it should have been the other way around.
One thing to consider is something like fructose malabsorption or some other kind of malabsorption and SIBO and all that BS. - The whole good/bad/too much/wrong place gut bacteria thing. I also have bad gas, i'm a walking human gas machine and i know that for me it is caused by fibre, basically all the "Healthy" foods but i have tried various diets that reduce my gas and make my digestion better and it never correlates with better skin - doesn't mean it wont with you. I think probiotics like Sauternes etc can actually bad for people who have "too much" gut bacteria or gut bacteria were it shouldn't be etc.
If you can try to isolate variables as much as is possible and stick to different things as long and as best as you can, i and i'm sure many others on here, switch from one thing to other and never really get anywhere apart from going round in circles.