[Canadian Man]

Well, when i had it hanging on the back of my tank i could adjust it so there were no bubbles making it into the tank. If i closed off the airline valve too much, than i started to have bubbles rising and going into the tank.
I know what you are going through, i feel like i played with that thing the whole time i owned it.

Anyway if you used the venturi attachment like it is set up now, and put it on your old skimmer, you may find some deffinate improvements.(like you said in your post) :D