There is no average W/H for a flyer. It's all about you.
I was a average ish weight for my age when i did fly and I was one of the bigger flyers, but that means nothing, because if I flew on another one of our teams I was on the smaller side. For high school I was even a smaller side of the flyers. As long as you can stay in the air and do your thing, it shouldn't matter. I'm 5"0 so everyone assumes I'm a flyer, does that mean i automatically am? no. I flew for two years Allstar, and based the rest, and flew my senior year on varsity.