Yes, the tricky part arises when you try and quantify those differences! I am also a bit of a numbers person, so I can understand the desire to measure everything, and arrive at the “right answer.” I wholeheartedly support you in finding good hard data, but I will also say that you can follow some very basic rules of thumb, and it will still work fine. If you are going to try and compile numbers, I would suggest you figure out some form of data-logger. I tried to keep tabs on like 5 or 6 variables once, and i spent the entire run scribbling down numbers.
I did not do rigorous testing, but I did see the start of a correlation with power output and nozzle airspeed. Sadly, its easier to make a hole bigger than smaller, so I noticed it as a loss of power when I enlarged the hole in my nozzle. Your screw-in nozzles will be convenient if you decide to test different sizes. I have used that spreadsheet too, and it should apply to any configuration of nozzles. There is also a chart floating around on here that talks about CO2 to CO conversion rates based on nozzle size and gas flow (ie nozzle velocity) and the differences are not huge. At some point the added drag of the system having to breathe through tiny openings is also going to counteract the richer gas that you should in theory be creating.
I think it would run fine in the current configuration, and will maybe run a little bit better with smaller holes. Only one way to find out