I recommend anyone wanting to understand HEUI injectors a little more watch this video if you haven't already.
https://www.youtube.com/watch?v=cw7a-D7gTIA Injector PW on a 7.3 or 6.0 is exactly how long the injector is opening the spool valve which is letting in High pressure oil that then pushes onto the top side of the intensifier piston which then pushes onto the smaller fuel side of the piston in the injector which then pushes on the fuel in the injector reservoir which pushes fuel into the injector nozzle which atomizes the fuel on it's way into the cylinder. The intensifier piston has a ratio of 7:1, so take your high pressure oil pressure, multiply it by 7, and this is what your fuel pressure entering the injector nozzle will be. As for making changes in the injector PW map it's a great place to start IMO. You now have an injector that flows more than stock at the same PW because of the bigger nozzles being less restrictive so more fuel flows into the cylinder with the same PW or injector on time. Therefore if you want to accurately delivery fuel and have fuel milage readouts be accurate you need the injector PW map to be accurate. But remember the PW map doesn't need to be accurate for your truck to run well it just needs to be close enough in the idle/light throttle area, anything past 40% throttle doesn't really matter except if you care about accurate mileage readout.... You can also drop ICP if you want to try and lengthen out the injector on time or PW, as it'll drop some naturally from the bigger nozzle delivering more fuel volume with equivalent injector on time. Your truck will require 0.5 to 0.6ms of injector on time at 1000PSI to idle, now you can increase ICP and get it down to around 0.4 maybe even 0.3ms on time, but the actual fuel amount delivered in mg or mm3 would be identical. If it were actually less then the idle would drop if it were more it'd increase in idle. But idle is a full time closed loop parameter so the truck would automatically ask for more or less mg/stroke to get the target idle in check... It also doesn't care if it takes 5mg or 18mg to idle, but a stock truck takes about 10-15mg to idle the closer you get yours to read that at idle the better it'll idle. 6.0's seem to like around 0.4 to 1.2 PW for idle Stock is 1.3ish and 0.8-1.5ms of PW/on time in the cruse range Stock is about 1-1.3pw on flat ground steady state 25% throttle input going 55mph. You change PW by adjusting ICP until you have your desired PW. Your log seems very close in those areas so that is good. You will need to increase the ICP flow map 3662 in HPT. I will say back pressure also needs to be set right, this is the most sensitive part when tuning these trucks. Also drop your gas tuning thinking, port injection gas has essentially fixed fuel pressure so when your PW is high you have no more fuel. Diesel's vary fuel pressure greatly so flow through the injector at equivalent PW will also very greatly. Pressure varies from 3000PSI to 27000psi, that's like a gas car going from 42psi to 378psi. Therefore PW is not a good way of looking at total fuel amount delivered like in a gas car. MG or mm3 per stroke is what you really want to look at, but then again if your PW map is wildly inaccurate then your actual mg or mm3 per stroke will also be wildly inaccurate... and your truck will run wildly inaccurate....