That was my nickname growing up. I had a really big head for my body size. My sister jokes and says I never grew into it (ego-wise), suggesting I still have a "big head" but I disagree.
Anyway, I would focus on eating clean foods, lots of raw fruits and vegetables and get some cardio in there along with intense weight training and you should see a drop in body fat percent. I have no idea what mine is when I compete or even in the off season, but I can always see quad definition year round. I don't always have great abs but I just do a bit of running, tons of ab exercises, cut out processed foods, and they seem to come back.
I don't recall what "ideal" BF percent is, but of course that varies from sport to sport and from individual to individual. I know they have a "standard" for health, but it doesn't mean much to me.
Anyway, keep on working at it, awesome to hear you've been vegan for such a long time. I'm nearing the 10-year mark. I'm over 10 years vegetarian and about 9 1/2 as vegan.
Glad to have you on the board, welcome!