Auto pots - second grow

Day 35 of flowering for my girls. Interesting week but has been a bit of a pain as I have been really ill. So for this week I pulled my viparspectra 600w to cover two of the girls and then the other two had a quantum 135w each. This was just an Interim measure until my other two quantum 135w arrived yesterday. What seems to have happened is that the girls with the quantum have developed more buds than the two girls under the vipar. I really wanted to lower the humidity as it was constantly 55% so I pulled my intake fan from my now smaller veg tent and started pulling in fresh air from outside. This air ranges from 0 degrees - 10 degrees currently and along with a dehumidifier is now giving me humidity of 40% in the night and 45% in the day. The biggest Suprise of the week is that I accidently set the ppm to 2100 and decided to leave it at that as I read these are really heavy feeders. It stayed at 2100 ppm for 5 days until a couple of leaves started showing very slight nute burn. I have now lowered the ppm to 1600 but just shows how much these girls love the nutes. Hoping the buds keep developing at ti His rate as they really took off this week, so much resin and the smell is beautiful even though I am completely bunged up. Will update again next week.