Gust the Backblast isn't needed. Reason is he's not a good blackwing
card and with him in the deck fills up space for other cards that can be
handy.
Breeze is good but his only downside is he can only be used to synchro
summon Blackwing Synchros so if you need something like Brionac,
Catastor, Black Rose, Dark End, etc he's no help.
As for Zephyrus the Elite. I like his effect but I just couldn't think
of what to take out for him. Could always take out 1 Lance for it and
that would make the monster count 19. If he helps only a little then you
could always side deck him.
As for taking out 2 Forbidden Lance. Now that Book of Moon is at 1 you
really need more defensive power. Yeah Enemy Controller is a good
subsitute too but I think you can do more with Lance. For example you
want to keep a monster alive for a certain reason since your opponent is
about to destroy it with a spell/trap and it can make your opponents
monsters weaker so something like Stardust Dragon won't be a problem. If
it doesn't help then you can always side deck it until the right moment
has arrived for when you do need it. It could also depend on what what
your opponent is playing.