I am not sure how you are going to control the flow, If you vary the pump speed to vary the flow, please consider the following:
Your starting pressure = 30psi+ 20psi (assummed manifold pressure) = 50 psi to get a decent droplet side.
You final pressure will be 160psi-20psi = 140 psi
The actual pressure change is 50-140psi, approximately 3x.
Translate the presesure change to flwo change:
In order to double the flow, you need 4x the pressure. So you actual flow range is about +70%. Do you think it will be adequate for your application? Can you pump create more pressure?
If you put a 15psi checkvalve inline to stop the water from vacuum siphoning , your pressure span will be reduced further to 65psi to 125psi, giving you less than +50% increase between min and max!
Richard