What is the issue?

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...

You have a ph issue and a potassium deficiency is showing. I grow in a dwc. I am about same stage and changing Reservoir once a week. I am running about a 1550 tds when I refreshed it today at half a 5 gallon with nutrition. Ph 6.2, 6.3 late flowering is ideal. Watch it closely. It will change as plant uses nutrition. Good luck and happy growing 🌱

Growing in water, if this is a photo period plant your maximum ec would be 1.6 ec, 800 ppm. If their autos then the max ec would be 600 ppm, 1.2 ec.. your ph in flower should be set at 6.2, 6.3