If I may, I'd suggest making the armies spawn farther away from each other. At the moment, fighting against the English armies, I barely have time to find a close-by hill, and organise my archers and infantry on it that I can already hear English cavalry right next to me. It's just annoying, and then there's also their actual tactics. So far I've seen two different ones for the English: charge like a bunch of barbarians, or advance ten paces every few seconds, going (their) left each time, except that they sometimes end up hugging the edge of the map ... Also, make it so that England is more hilly. I don't actually live there, but I go there frequently, and it needs a few more hills, as well as a few more trees, and overall remember that in those days, there were many more forests, so you might want to add some, or make the already-present ones bigger.
Aside from that, could you tell me the benefits of the various factions. English seems the best overall faction, having numbers, and all around units (they've got archers, spearmen, heavy cavalry and infantry, very well-rounded), the Scots have good infantry, but some of their lower tier cavalry is surprisingly bad, getting killed at every fights. I don't know about their archers, but they should be good, right ? The Irish have good archers, haven't tried their infantry much, but their horsemen suck big time, while I haven't had a single loss for their knights ... I don't know about the welsh, but they seem alright ... despite being welsh.
A few other things: if possible, change the Sea Raiders to something less Viking-ish, make the foot-based troops have more athletics (I'm thinking Scots mostly, they'd need to be quick having little cavalry) and perhaps stick the claymore on the back ? And give it a sheathed model and scabbard ? At the moment, it looks like a normal bastard sword when sheathed.
Other than that, great job man, this is a very good mod !