again its hard to discuss if you havent played in mp - play the mod and then let me know. Things at times need to be a "little" off to give balance. Yes I am from Poland, but actually the ic level thats there is what Mithel originally did without my input- and he's from the USA

. If I used all numbers directly then many nations that had a bigger influence couldnt do much due to the raised costs of units, changed mp, changed resources, changed supply needs, changed reinforcements costs, battle system, sliders etc etc etc. Players did want more ic and since the balance has not been threatened thats what they got.
Its not crazy that Poland's ic is greater than that of Spain - the above GDP list just proves that it was. So I dont understand your problem. The ic poland has still "only" enables it to get the circa 1000 k troops it had at the level. Believe it or not its there more for germany (germany usually kills poland off historically in 30 days with no problem) to gain the ic off the polish lands (as its weakened a tad before danzig) - which it needs to recieve a boost before France. Furthermore a portion of the ic goes to russia which make the RM pact a more "natural" course of action - which this mod prefers. Poland still dies dont fret. If more german players say its too high it will get a peace modifier so it has less available IC. I would be against changing ic base as that would give germany much less ic.
Romania - yes I agree they do have more ic than historical and I will not argue that they dont - on the other hand they really need the extra IC to compensate it for the more head on situaton it has with russia or germany plus to get their army to "historic" levels. So It has that IC specifically as it would be too handicapped. There actually were calls to add more ic which is not a good idea IMO. Note that they also lose 8 ic in the russian event. Usually another bargining chip in the MR pact.
Spain, which btw didnt join the war and thus never went to war production thus makes it harder to estimate, shouldnt IMO be given more ic, as it, due to its geografic position, can benefit the side it joins greatly and cause unbalance. Due to the larger cost of eg aircraft it could be too successfull in producing techs (with the extra slots) and potentially greatly complicate the balance. Frankly I would be for spain to be played by the ai each time and not want to join any alliance in the game. Currently the way I see it it compensates canada just fine (same ic levels).
That said Spain has recently recieved an increase of techs from the feedback recieved from players that had spain under their control in mp and is always open to review after mp sessions.
Thanks