hmmm, I would think tool life and cost would out weigh coolant price but then I don't have to buy it. 35:1 is extremely lean, we run ours at 8:1 but then our machines are much larger and cutting a lot more out at a time. The verticals run 3-6 of those flood nozzles you have, our Horizontals blast the stuff all over, and through the tool. You can take some massive cuts with them but it chews through 30-50 gallons of mixed coolant a day.
Looks good though, Was just curious as to your reasoning. Thanks.