Having finally caught up to all the current content, optimization is gonna be a challenge, especially with the amount of character quests and the final section still on the horizon.
On that subject, Fulminato, since I'm unsure as to what investments have been made between the end of the second gathering (following the minmax route) and the save you shared earlier, but from what I can see, you're short just about 177.500 PRoN to get the best IW aftermath results, since both Theltiar rentals (425K PRoN) and something in the OE need investments, all OE investments, either smuggling or refurbishments will require 500K PRoN.
As I said though, not sure if it as simple as choosing 1 different investment after the second gathering, or if it requires a different choice in investments somewhere earlier down the line, comparing the country scores in the save from before the IW and the country scores in the pastebin sheet, I think it's simply a different investment to be had after the second Incubus war, since there is a large shift in between.