I don't feed my ferment the same way as you do .Just a note on the ff and sour crop...
Some folks have encouraged using YEAST in the fermented feed. This is NOT good fermented feed practice and is likely the cause of any issue that someone may have w/ sour crop.
When fermenting feed, LACTIC FERMENTATION should be used - not yeast fermentation. There is a complete write-up on the differences of these on the blog.
If lacto-fermentation is used, you won't smell yeast or alcohol in the feed. Even if you haven't added yeast to the mix, natural occurring yeasts are in the air and on surfaces everywhere. The key is to keep the yeasts under control by having lactic acid producing bacteria having the upper hand in the mix. Balance is key.
This is just another reason that: If your fermented feed ever smells of Yeast/Mold or Alcohol DO NOT FEED IT!
I start with ACV. I don't let water sit on top (because it is just too hard to feed if I do), but otherwise the smells are the same. Sour, not yeasty or moldy. I have had it smell like alcohol when I started too big of a batch just for chicks and did not replenish the food - but I still fed it. They didn't get sour crop, but their development was delayed.
I have since stopped doing such big batches, as it is just too much.