You've already been on for a decent amount of time, in another 16 wks, you'll have been on for 1/2 a year. I would suggest you come off and get some labs done. At this point, things are probably out of wack. I would suggest you run your PCT, take a break and allow yourself to become more sensitive to your gear. Going from 1200mg of hormone to 900 or so mg's, probably isn't going to give you a strong effect, compared to what you'd get from it, if you cleaned up for a bit.
When you do this cut cycle in the future, I would use no less than 400mg of primo. I would also restrict the use of winstrol, injectable or oral, to no more than 6 wks.