Sorry for the late post. DevilsOwn is very busy we are short handed, and every time i post on here me and david get into it. So to keep from arguing with him i just shy away from this forum.
the micron size on our nozzles are in the 22-26microns range. For the 1-14gph spectrum. So its not going to make that big of a difference going from a 5 to 4x1 nozzles.
I personal think direct port injection is not worth the cost for most people. 1 or 2 properly placed nozzles should get you the cooling you need and keep your wallet not empty

Dp should be used in applications that are having issues with distribution issues. So you should call and i will tell you how to check for this. I dont' want others to know all my tunning tricks

Remember bigger is not always better and 10gph of nozzle should be used on a pretty mean srt. I don't know your setup so its hard to give much advise on size.
Just call me and i can go over your setup and i will give you the 2nd nozzle holder. You should not have any issues rigging up our stuff to coolingmist setup which uses parell thread fittings.