Hello,
I agree that your plant does seem pretty healthy...even with the drooping leaves. The only things that came to mind would be 1) did the droop happen after you changed your res? If so maybe a small adjustment period. 2) when you changed the res did you notice if your roots were white and healthy or is there any discoloration? 3) what sort of air are you adding into the water? Maybe boost that a bit?
Good luck with the process....hopefully shell just grow out of this small bump in the road.✌️