I go to 5. It's a good thing they are eating up the ec. Don't go do something that makes them stall out, like overfeeding them ;). Now that you have the new growth looking all good its a sign they like what you are doing. Let them go a day at that lower ec and don't ph 6.1. Wait a day and see if it rises to 6.3. Your girls might eat best at that 6.1 range. Sometimes when I have ph fluctuations that I am chasing daily, to stay in my desired range, I'll hold off at my high point "6.1" and I'll see my girls just sit there as they slowly drop my ec from there. Now, I don't drop my ph, in flower, till I see 6.2- 6.3. I start at 5.8 and feed ro at 5.0-5.6, depending on my week, then I drop at 6.3 to 5.8. Also my girls eat 100 ppm pretty fast. They slow down a little to get that 200 ppm drop be for add back. Like I said it's every 2 - 3 days before I touch my UC. It let's me see how hungry they are that week and that shows me how to hit them the next week. Keep rockin it man...