Screwing it tight will increase the pressure. Sound like your doing it right, im guessing its sucking liquid through, if your bottles laying flat you could do with a dip tube in it, as i had this problem with Ratchet. Next time you test it try it with the bottle standing up see if its any better. As for it not repressurising, the only thing i can think off is the reg is sticking, was the regulator cold?