Yeah, I have it barely open now... on my Herc it's VERY picky about where the juice control sits, it's either dry or wanting to flood with very subtle changes. My Oddy doesn't care, can have it really open wide and it still never floods.
On the Terminator it was always that 9 x 2 mm mouthpiece o-ring not sealing for what ever reason so when I experieced the same symtoms on my Ithaka I ordered 50 9 x 2.5 mm o-rings for it. Got them, put one in and still had the problem, it was the 16 x 1 mm o-ring on the upper body (next o-ring down) that was allowing air to enter.
It sounds like the same symtoms as what I had going on, ok, then minor flooding, i'd mess with it and it would maybe be OK for awhile and then back to minor flooding.
Btw, my mouthpiece is generally about 2/3 of the way open.
This is an Ithaka, well almost, the window and the mouthpiece is 3rd party Oddy parts. This is how far the mouthpiece has been open for the last three hours since I open it to take a picture of the coils for another thread.
I have corrected the mouthpiece o-ring sizes listed above as they were incorrect, hopefully nobody ordered any using the previously posted sizes.
Terminator mouthpiece o-ring size is 9 x 2 mm, tank o-ring size is 16 x 1.5 mm
Hercules mouthpiece o--ring size is 9 x 2.5 mm, tank o-ring size is 16 x 1 mm (optional size 17 x 1 mm)