The yellowing depends on what part of the plant it’s happening to.
If it’s on the bottom part, it’s just taking in the rest of the nitrogen it has left.
Top part could mean many things.
A picture is worth more than anything I’m saying tbh.
The picture you uploaded, those plants don’t look bad, just probably lacking a little o2
If I were you, I’d just continue feeding the amount you have been.
Maybe up the N slightly, if that’s what’s causing the yellowing (need pic).
Once you get the drooping problem solved, do as you said with half bloom.