Okay, d/led it and took a look. I like the layout, though I would have to Xify it to play it - too used to the new stuff.
It's only superficially like mine. But I don't think it would be particularly challenging down south since the other forces seem a bit soft. Like Liu Zhang only has 20K troops, Liu Biao only has 25K. And you might want to give Liu Biao another city or two, at least Changsha. Jiangxia is super easy for an aggressive Wu to take. The north looks more or less fine to me.
Might be best to merge the guys in Yang. They'll just end up bashing Yan Baihu otherwise.
Re: missing forces. Some of them will probably pop up in empty cities given time. I know Gongsun Du is willing to claim Xiangping if no one owns it.
As for Jin. Sima You and Sima Zhou if you haven't yet. Wang Hun. Xiahou Ba. Zhang Chunhua if you haven't. Hu Fen is feasible as well. These are the folks I used in my version.
Jin's position seems a bit odd. There's no real precedent for where the force would start, maybe Luoyang, but that's up to you. Oh, and assign a strategist.
I like the 194 idea. I was going to go with 184 myself, 251 gets stale.
You could also give people on other forces their kids. Like take Wang Lang's force. You could beef them up a bit by tossing in Wang Su and Yu Si.
Lastly, I think our scenarios are different enough that you shouldn't worry about that. Mine has big coalitions rather than separated forces. Almost no free cities. The general outcome is also highly predictable. Your scenario leaves plenty of room for randomness, so I'm sure it will appeal.