I use to use All flock and did for years and never have had angel wing in my flock. So yes if you have two bags and don’t want to waste mix. I went to NON GMO is my only reason for not feeding all flock now.
A lot of members here feed all flock because it has everything they need and with foraging the protein level drops some. Main thing is the niacin levels in the all flock is where it should be for water fowl.
They are beautiful ducks and look very normal. If feeding I would have stayed with the All flock since it’s formulated for all poultry including water fowl.