First max you're heroes, than I'd say go for as many model's you can and I'd personally would skip on bows for orks and just rush forward do to animalisity. And I'd go for 2 weapons on boss if posible at list when you in close combat already I mean you still got a dagger for free and with
str 4 on boss there won't be +1 armor save + he will still get bonus for shield from shooting, but - 1to movement . I'd go max heroes and than max orc Boyz with axe dangger each. But if you have a good group who don't go for
op list just make whatever. I like 2handers on your black orks
id say keep em for sure
.