Scott, I wish I had something to tell you, but I don't. Evening water temp was 84.5, so probably upper 70's in the morning. We can comfortably move fish for a couple of months, and put them in ponds that are within a mile of here. I don't have any O2 numbers because I don't have a monitor. If my big pond went south, I'd have no way to correct it anyway.
That Point Four micro bubble diffuser I use in the ice chest is small, but it can be daisy chained if needed.
I thought you had a meter. If you are moving fish in those water temps you are probably safe. Cooler water temps and you might have too much O2 in the water, that's why I have to run 50% the O2 volume that you do if I have a light load in a tank.