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Hi Neil,
From your figures it looks like your vO2 is 1.22 l/min. At 1.22 you could run 45% through the 60% jet for a loop of 30%. 50% through the same jet would get you a 37% loop.
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Thats right, my VO2 is generally about 1.22 and that is when just pootling about. Have nearly doubled this when I annoyed an Angel shark by mistake. (it was buried in the sand like a ray).
I do have an Excel sheet set up for these calcs, but usually use a set of calcs on a palm. These also do the partial pressure blending calcs for me.
I am in the process of closing the loop on one of my Dolphins, with parts from Tecme. I intend to set it fairly lean (0.8 - 0.9 lpm) and do a fair amount of injecting as I can add O2 easier than I can lose it.- shut off O2 or vent and flush loop with dilutant. Like you, more worried about hyperoxic rather than hypoxic loop mix.
Neil