I've only just seen this post, but this got me thinking; if you move your capital to Paris, and then make Cosmopolitaine (French) your primary culture then you should be able to form France. This would be a major boon, as it means that all French cultures are accepted cultures in your nation, meaning you don't get any penalty to your tax income in provinces with those cultures.
Basically, at the moment you only get full tax income in your Irish provinces, and possibly in some French culture provinces that make enough money to be considered "accepted cultures". However, if you were to become France you would get the full tax income in all provinces with French culture.
Of course, if you form France then Irish may not be an accepted culture (though it might, considering your large colonial empire), meaning you'd get a penalty to tax income in your Irish provinces. Hmm.
After I read this, I went to make a quick check:
Ireland, all five provinces:
11.168 people, 35,48 ducats.
Province of Mexico, which would have been the capital in America:
9.922 people, 42,94 ducats (the main gold producing province)
Ille-de-France:
235.856 people, 42,33 ducats (that is not counting the rest of France)
As you can see, if I lost all of Ireland itself I would harldy notice the loss. But well, I am playing with Ireland... if I became France, that would hardly be the point of the game (even if it would be the realistic option...)... My original plan was to run away to America when England inebitably conquered the island, gather strength and build a proper armay and navy with the American gold, and then return and conquer all eleven celtic provinces in England and Brittany. This was delayed when I had to spend thirty years paying attention to France, and now it wildly succeded exile is unnecesary. Still, since for some reason your capital does not move to Dublin when you form Ireland, I may as well move to Paris...
Personally, I'd mod the game so Irish would be an accepted culture for France, or mod in a new French-Irish/Gaelic state that you could form with all French and Gaelic cultures being accepted. That might give you a bit too much of an advantage for your liking, though.
Mod.. yes, of course, mods. Of course I know how to mod, siree, honest... ~nods forcefully~ I am modding all day long...
Still, while I am usually one to cheat, moving the game settings is enough of a cheat for me (I elect colonists and priests free, plus 400 colonists with each colonist)
How's the HRE going in your game? Is there any chance of you becoming Emperor?
I dont' remember if I mentioned it, but I got France after a war of sucession with the Palatinate, and I spent all my money and diplomats kepping my relationships with France high, so, right now, they are low, and I must spend another small fortune to rebuild my army, as it seems all of the french soldiers decided to retire for a life on the country now than the mighty Ireland was protectiong France.... Soon I will have money to bribe electors as needed, but I have not decided if I will do it (I am honeslty considering the idea of, well, destroying the empire, our of sheer curiosity... I have always played nations on the outskirts of Europe, but now I have a chance....)
P.D: By chance, I discovered a fortune maker, which I have not mentioned as, being a noob, I though it was not my place to give tricks than everyone would know, but then I realized I am not the only AH.com newbie than would buy the game and then rush to this thread.
I have spent a fortune -well over 1500 ducats- in bribes to keep France happy. How did I manage, if Ireland produced the measley sum I posted above? When you invade the Mayas and Aztecs, being pagans, you can annex then all in one go. But if you conquer then, and annex all but the capital province, you can pad the remaining until 100% with tribute. They are loaded; I got 1500 from the Aztecs and 1000 from the mayas. Once the truce ends, you can eat then at your leisure, ofter with a single cavalry troop. I suspect the Inca may be similar.