Well, i've seen cultures, cores, and even now manpower increases, handed out by the truckfull in nearly every game around here, via claiming rules or aar rewards, so obviously people don't care if those become 'unbalanced'. Besides which, you didn't even read my post, or you'd know that nowhere did i support removing the historical leaders, just equalizing them. All i see, is that virtually every player plans their wars around leaders, and nothing else. He knows when, where, and for how long the person will have them, so the only goal is to grab as much as possible during the time of those leaders, and hope to not lose too much in between. I would get damn bored, playing that kind of game; probably why i've always played vicky, where nations have more chances to potentially win wars at any time period, based on all game factors, not just who has the most uber-leader at one time, be it Alba, Prince Eugene, Suvorov, or Suleyman, etc, etc.
Most of the problems you describe, have to do with some of the things that pop up as issues in vicky MP. some of the people in our community ask why prussia should be allowed to unify early in 1851, and the answer 'balance' comes up, because the argument runs that with large powers bordering it (france, austria, russia), germany has to be complete early, so it can compete and provide balance in europe. Lets take one of your examples: the OE running riot long after its time has passed. Why does it do that? Its of course not due to uber-leaders, but to all the manpower they get while they had those uber-leaders like Suleyman to go conquering with, to gain that MP.
Lets compare some recent developments. In the last few vicky games, austria has been intervening and taking part of south germany for itself, even forestalling early 'ahistorical' unification. Yet, germany has still gained power, and been a force, despite the rich in population territories that are lost (i still took a germany to number 1, even with much less of an advantage due to such factors). Lets look at your EU2 problem. Suppose, now just suppose, OE suddenly realized that not only was Suleyman not superior to every russian, austrian, venetian, and spanish leader of the time, but also, there was the possibility that a random leader or leaders could be just as good. Our OE becomes a bit more cautious, and perhaps his normally 'given' conquests of north africa, the mamelukes in syria/egypt, persia, etc aren't so assured, that other powers could intervene against him, where they couldn't before.
Look at what we just did: we made the majors all 'potentially' competitive in the region; we introduced a novel situation into the game, thus making it more interesting. If a nation can't just grab everything in one swoop, be it in the early, middle, or late game, its not going to be dominant for the rest of the game. I understand that other factors, such a number of state culture provs, number of core provs, and manpower aren't balanced and equal in the game, that nations like portugal, sweden, denmark, etc, are limited by these things. But thats how things go. It *should* provide a challange to the player, and it does. Perhaps, we could discuss some form of compensation to those minor powers that lose the most. but since EU2 MP seems to be built upon a core of about 7 or so nations, my suggestions mostly concern those majors that are most played, as i think i have made clear. Hopefully my elaboration and clarification help you all to understand my basis for the proposal.
GM