Yea basically, if you shoot upward the siphon sucks air.
The thing about Creek gus is its all or none. if you run liquid, you need liquid all the time or it stutters. so duals is best. or vert front bottle. if you run just the back or a bottom line you want to make sure you dont shoot towards the ground to much.
Its the same if you run non-liquid. keep the liquid out or it will stutter.
ICD said after they switch the hanger, more then half of the repairs for guns not shooting right stopped. it seems people are not willing to go onto the field with just a 9 oz under the barrel.