You have some beautiful ladies there. I like the structure of the Swiss Bliss. That girl would be fun running a scrog.
Keep those pics coming.
Peace
Bloodmeal is a fairly fast fert, almost immediately available, they've probably used most, if not all of what you've got in the soil...
There are some simple solutions, the easiest, and cheapest one, since you're pretty far into flowering is urine. Diluted 20 to 1 it will green them up almost immediately, and won't last too long as it's immediately available N, and what doesn't get used tends to become ammonia, and leave the soil as a gas.
Or you could buy something.. maybe make an alfalfa tea, or one of your veg ferts at 1/4 dose?