Yes. Without progressive control, you get what you get. You start spraying as soon as the car can handle the flow without misfiring, but you want enough flow to have a decent impact on cooling at higher load and RPM. You choose a nozzle size and spray start psi that gives acceptable results. Cm3, Do3 or similar a good start for this car.
It's a compromise, but it works because modern (especially this) cars are smart enough to adjust. So yes, your probably spraying too much on the bottom and not enough on top, but the car doesn't care because it will adjust for the fuel and IAT difference caused by the spray.
It may not be perfect, but a non progressive low flow setup works good for basic cooling and timing improvement. The important thing is that you have made average conditions better for power and the car will adjust.
Made up example: No meth, stock intercooler, 80 degree day. IAT125F start, 110F midrange, 115 top end.
Or
Non progressive cm3 start@ 10psi 80 degree day. IAT 125 start, 90F midrange, 100 top end.
In the example above, you lowered midrange temps 20 degrees and 15 on top. And you added a volume of vapor to the combustion chamber that will lower tendency to knock or pre ignite. You could always do better with an optimized setup. But this is good enough for more power. Cooler air, more power. Cooler air, more timing, more power. Cooler combustion and higher octane, more timing, more power. It all ads up.
If you want to push setups farther and get the most benefit, progressive control is good. But a basic low flow setup is a good gain over nothing. Probably as good or better than an intercooler upgrade.