Before I begin my suggestions, allow me to say that this is a fantastic mod, and as near a video-game approximation to what i believe the Viking Age is that i've ever seen. Your armoring scale of troops is fantastic, with even sometimes veteran troops having little to no armor at all, and equipment is very well done and remarkably well balanced.
One of the areas I believe can be improved is armor variety. Your coloration is spot-on, with colors at just the right shades as to look dyed (except for one blue tunic that's a little too vibrant). I believe you can expand into different types of armor than just gambesons and chainmail. You could add linen and wool padded armors, and even just heavy wool tunics as a sort of light armor. Viking lamellar is not an uncommon thing, espeically leather lamellar made of boiled leather lames. As well, scale armor (scales riveted to a leather backing) is known to have existed in the Viking world. Splinted bracers and greaves, of steel and iron, were also common amongst elite soldiers.
I also suggest, for a historical sake, that you made leather-rimmed shields as opposed to steel-rimmed shields. Steel-rimmed shield remnants have been found only in a rare few grave finds, while many more shield remnants without steel rims have been found both in gravesites and in field finds. It is also not uncommon to have a shield with no lining at all, while at the same time some of the elite shields are covered completely in leather. As for shield coloration, your patterns are quite spot-on. Although there's no way to be certain, the impression is that intricate designs on shields were rare, and limited to elite soldiers, since the shield is understandably not going to last long in battle. I do suggest you use less black and replace it with grey perhaps, since black paint was hard to come by in those times.
Besides these more aesthetic concerns, there is an element of gameplay that feels off. While your relative weapon speeds are particularly good, with swords, hatchets and seaxes being faster than hand axes, etc, the overall speed feels too slow to me. I have some re-enactment experience with many of these weapons, and the overall pace of combat for my own character feels just a bit too slow, especially when wielding two-handed axes. I suggest a slight, universal weapon speed increase, and give 2h axes a large speed increase, though still just slightly slower than most any other weapon on the field.
I realize all of these suggestions are quite large in scope and work for you, but i do have a quick-and-easy one, as well. In my mind, the boar spear should get a bonus against shields, though perhaps not as great of a bonus as axes. The wings of a boar spear are very useful for sliding around the edge of an opponent's shield and, with a good hard yank, swinging it open.
Please believe me when i say that i think there is absolutely nothing wrong with the mod as is. It is a fantastic piece of work that comes as close as digitally possible to representing a true shieldwall, which is the core of Viking Age combat. My opinions are precisely that, opinions on how I think the game could work better, so I won't be offended if i'm ignored completely. If you'd like to talk about anything i've suggested more in depth, feel free to PM me.
~Jariik