@Teknokraatti:
I've been waiting for your reply, you've been lurking this forum for days on end now xD
Good point about the skill that goes with using armour. It also has offensive benefits if used correctly. These are well enough included in the units skill/veteran level.
I do have multipliers for infantry as 1.0, spearmen as 0.9, ranged at 0.8. I also have some basic logic on the unit weight where they have some armour or if they have better armour it increases. This isn't necessarily weight related as better trained units tend to have better armour so it correlates.
Also shield units should have a lot higher weight in combat but I am pretty unsure whether I want to give them that as shield is already so good. This goes double for shield wall units.
PS. Did you weld the ringmail together?
PPS. Armour weights were directly from wikipedia so chop, chop. Get to work!
Yeah, they have normal javelins, which projectile where they supposed to have?
EDIT: I should note that unit mass, like most stats in TW(I'm looking at you shield!), is problematic because it affects more than one ability of the unit. While teknokraatti is completely right about unit mass being very high for aggressively fighting, skilled, melee infantry that can force the enemy units back during the engagement, you can't do that. Another very important, if not even more important, factor is their ability to hold back charges, especially cavalry charges in vanilla but in HTW that includes rolling gorons and all kinds of large units. In vanilla the spear stat deals with this pretty well since most things that can take a cavalry charge are pikes/spears anyway. In HTW it's a lot more problematic because spear stats don't do anything to gorons or any of the large units. And while skilled, aggressive warriors with little or no armour can easily push back less experienced armoured warriors they sure as hell can't take a rolling goron in their face that well! This is why heavily armoured units or units with pikes should actually have very high mass in HTW. But if you do that you lose all resemblance of balanced melee pushing between normal infantry(spear stat already gives units a pretty high pushing ability to begin with.) Just can't win with a system that's not designed to handle all of these different styles of units.