Squeeze those socks often as well. When I add a sock with about 2 lbs of stabilizer, I can let it pre-soak near a return for about 20 minutes then I squeeze it all out in about 15 minutes. But by the end of this evening you should have the sock all expressed and empty.`
3 lbs of stabilizer should've increased your CYA by some 18 ppm. I don't recall where your CYA started but it needs to be 30 minimum. So if you need to add more, add only about 10 ppm worth - about 27 ounces. Then continue to maintain the FC of 12.