I use Coco perlite Hempys. I normally have the opposite problem in flower. I don’t pay much mind to coco ph runoff but it does seem to rise a bit when comparing results week to week. Will salt buildup cause the rise in ph? Also, may it be under feeding?
As far as the problem I’m seeing here, I would switch to hydro nutes. You’re using coco specific nutes but not using coco. What you may want to do for now, mix your tap and RO water down to about 80 ppm. Add your Sensi Bloom until total is 580. Leave out the added calmag. My rap water comes out at 70 ppm. I feed my plants this way once every few days. They seek to like it.