What a beautiful bow. Well done dude.
Y'know, you're drawing that by just pulling straight back, and it looks totally comfortable and in control. If you were to step into it, with your weight forward rather than back, and roll the ol' shoulder, I think you could be shooting quite a bit heavier. The really top guys are always going on about leaning forward, and down into the bow, which pushes it away as you draw back. If you stand upright, or even lean slightly back you don't gain that advantage and you're fighting it the whole way.
I may be wrong, and you might be doing it perfectly, but when compared to Mark Stretton for instance who visibly leans forward with all his weight on the front foot, it's markedly different.
Hopefully Jeremy (yeomanbowman) will reply as he actually knows what he's talking about!
Anyway, sorry to digress. Lovely bow, great tiller and exceptional performance if it's chucking 77g arrows that far!