Got It ! Using the tapered pipette the inlet doesn't have to be offset. I just have to decrease the diameter of the opposing pressure well to the same diameter of the pipette, and keep the inlett slightly proud of the throat.

The use of the needle wheel impeller is even better, producing a much finer cavitation, and the ceramic bearings are a huge perk !

For a 1/2" flow the mixing chamber should be appx. 4 " long. Maybe 5" tops.

If the swirling veins are in the venturi, and the affluent is compressed. The reactor is eliminated...