1.) The mod's Emyn Arnen is far too large
2.) The mod's Emyn Arnen is practically a vertical oval, whereas in the two other maps shown, it is far more of a horizontal oval and in the third map, it is a few different parts of hill.
What do I Suggest: Very simple, just alter the map accordingly. I can't imagine this takes all that long. Another idea is to have Arnen foothills between the different parts of the Arnen, although this is certainly optional.
Arnen Ruins: It is said that old nobles of Gondor used to live in the Emyn Arnen before fleeing from the growing threat of Mordor. I suggest adding ruined mansions as a structure that would spawn rarely in the Emyn Arnen. These mansions would range between nearly intact (aside from moss) and almost completely annihilated.
So yeah, that's that. Sorry if the formatting is crap, I'll fix it if it is.
As always, Constructive Criticism is welcome!
Signing Off Now - Arcen