Mix per the directions, and mix enough water so that your pots fill up and start seeping out the drainholes.
I'm day 36 flower as well, and I do:
- full nutes
- full water
- half nutes
...every three days. My plants are liking that regimen. I've got 3 x 3.5 gallon pots, and one gallon of feed mix saturates all the pots, then I split a 1/2 gallon across all three after about 15 minutes of the water dripping out of the bottom (the 1/2 gallon stays in the pot once they're already saturated).
-spek