If it's a V2 and leaking with the grub screw installed in the 510 pin - don't know what to tell you.
If it's a V1 or V2 and leaks from around the 510 when you squonk, try tightening the atty a bit more (don't force it). If it still leaks put a small drip-tip o-ring around the base of the 510 connector on the atty and re-install it on the mod.