Also a rdwc grower here, i'm in week 8 flower Liberty haze photo. Flushing of course, almost ripe trichs.
In week 6 i give ec of 2/2,2 and week 7 ec of 1,8/2. Ph is fairly steady at 5,9/6,2.
The ph is rising a bit, like 0,3 in two days so i check every day. Refresh nutes every week.
Ph is better around 5,8/6,2.
But you also have deficiencies going on. (P/K/Ca/Mg)
Don't overfeed in the late stage, it will reduce the taste of your smoke a lot.
And make sure that you flush her for a good period if you're a real feeder :P
Also i don't know how big your ladies are but mine are around 1,6 meters high and around 80/90cm wide...