I'm not sure if the ozone kit comes with a contact chamber, but I would look into one.
Ozone needs time to mix with the water, and a number that is bandied on this board alot is 22 seconds before ozone is "absorbed" ? by the water.
If the ozone isn't in contact with the water for at least 22 seconds it will come bubbling up out of the top of your water and could be irritating or, at least, provide an unpleasant odor.
Some spa manufacturers use 1 (or 2) contact chambers that vary in length from 10' to much more (doesn't D1 use soemthing like a 20' or 30' total contact chamber(s) length?)
I would look to find a way to keep the ozone in a chamber where it can really be mixed up first.
Secondly, I have heard that there are three types of ozone generators - UV bulb, CD, and plasma (new?) UV bulbs degrade over time and people recommend that 24/7 ones get a new bulb each year. CD ones have either a replacable chip(replace each 3-5 years) or replace the unit (7-10 years?). They generate more ozone than UV bulbs. Plasma generates more than CD, I think, but have no specs.
Might not answer your question, but just some thoughts.
_Ed