Emag on offs have a shorter pin and different o rings.
Try a different on off.
Or try replacing the black (quad) o ring.
I wouldn't really call it a chuff. Here is my setup:
Emag valve that I pulled off of my emag.
Level 10 that was already on the emag
I'm looking to set up a Qloader or Warpfeed 'mag.
I'd like an interesting Warp-style body... something different like a Tac-One warp or XMT