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How do you retune the cracking pressure on the ADV? Since it is a schrader valve with a built it spring you can't really alter the spring tension
I would suggest if your adv is not firing because it does not hit squarely against your chest then an adjustment of your counterlung or possibly taking the twist out of the breathing hose between the T-piece and the head will fix that.
Haven't taken it apart, but I adjusted the lung and t-pieces a couple times and every time I was diving min-loop it kept getting pushed off to the side since it was turned off. I'm sure if it was left on it would increase the lung volume a bit and stay put, but it just isn't something I want to mess with compared to going to the iBov that has the ADV built into the mouthpiece