There are lots of ways to skin a cat. I do a Cyclical Ketogenic Diet (CKD) where my ratios are generally 60% (Edit: opps, make that 65%) fat, 33% protein, and 2% carbs with a once a week carb load where the ratios switch to 70% (clean) carbs and 15% each protein and fat. Works for me and I've been on it a year although I stopped for about a month during the holidays. I dropped from 20% bf to around 13% in a few months then I started making my carbup day into more or less a free day to make it easier to maintain the diet. You can drop some fat in a mofo hurry on this diet without losing much muscle mass.
I will say the only strenous activity I get lately is weights a couple of times a week, some running, and 3.5 league tennis. The point being I'm not sure how someone in competitive martial arts would fare on a CKD so YMMV.