Topped these girls for the second time a few days ago. I plan to top them one more time and then I will flip to flower shortly after. The POTG has recovered nicely from the broken branch and the blueberry muffin still has kind of a funky look to her but she seems to be catching up.
I'm kinda having same problem as you atm. What helped was getting a kitchen scale to weigh your medium bag dry then fully saturated and you deduce the water content for a small plant then you can do proper drybacks and maintenane shots as well as how much she transpires once they pick it up. Note that a standard 5Kg scale won't take more than a 2 gallon and you will probably have to make a stand to properly use the scale so check the scale capacity for your medium but if you can calculate water content you'll do better in a smaller bag.🙌