I need to know I have one week for two kegs to finish catrbing, one has been on a set it and forget it for 2weeks and the other has been on pressure according to chart with shaking for 1 week, when I sampled both neither was really carbed. I checked the seals and all is good there so no leaks. My regulator is reading about 500psi remains, but I know these can be pretty inaccurate. My question is why am I not getting any carbonation after these times at a temp of 36F, I have pressure in the tank and I could hear it going into the kegs, do I just need more time? Also since I need these ready for the 4th can I safely bring the pressure to like 20psi, shake, allow to sit for and hour drop the pressure down check where carbonation is at and then repeat?