That's a great question, because I have two Aeris Atmos XT BCs that I bought for my sons. Their tank straps leave a lot to be desired in my opinion. We had a tank slippage problem on one at depth, which was solved easily, but that's my freakin' kid we're talking about!! Then, in an effort to make the strap tighter on a dive after that, the plastic that holds the strap broke altogether!!
My solution is to go back to the dive shop where I bought our gear and have them fix it for free. I have a brand new BC because they are a great dive shop, the BCs are still less than 6 months old, and I spend a lot of money there. I hope someone on the board can help us here, because eventually the shop will stop replacing the BC.
Also, be sure that you have the latest inflator button. Last year's Aeris Atmos XT inflator button was recalled for sticking. But that's another story that really ticks me off!!!!!
wetrat