I have a BF and normal Magma. I squonk the BF Magma like any other atty and it's never enough to fill the basin and reach the air holes. What happens though is as the
juice is drawn to the wick and coil some gets in the air hole by sweat and condensation and it gurgles a bit after a while. I'm going to try building the coil as far from the air hole as I can, next coil build, but the position is going to affect the flavor too I suspect.
I have seen pictures of Magma's with metal tubes fit snugly into the air holes that sit a little higher than the deck on normal Magma's.