Seems like the cm7 nozzle is the way to go?
Depends on what your goals are, your local environment (temperature) and how much you are pushing your setup.
Some rough examples:
CM3
You have a stage 1 type setup, want some extra cooling and a margin of safety to confidently run 93 octane settings. Or you have an awesome intercooler like the Wagner, but want more, CM3 is good. The advantage here is that setup is less crucial at this flow rate. You can just start spraying at around 7 psi and not worry.
CM5
You have a stage 1 or 2 setup and want to push it and want impressive cooling without buying an intercooler, maybe be able to push to race gas levels. Now your on the edge of where you could benefit from or need progressive control using JB4. You can choke out the engine if you spray too early, but if you spray too late, it takes longer to get cooling benefit. Starting spray at 10 without any control works. But I've noticed sometimes in traffic, if you get into light boost, get off, then back on again, you'll get a light sputter from too much spray. You will see trims go down as you are adding a decent amount of fuel. Maybe you could up e85 percentage now?
CM7
You have an over 300whp car, you're pushing your setup hard, want max cooling and extra fuel margin. With progressive control you can start the cooling party down low RPM/boost and then have balls out cooling/extra fuel headroom and octane at top end without choking the engine or wasting methanol where you don't need it. Race gas setup, potential for below ambient cooling, impress your friends with how "cool" you are.