Originally Posted by
Prinny
You could always raise his size with achievements. there are +2's, +5's and one +10 size achievement you can get.
I would advise to wear slightly less heavy armour, probably a mix between heavy and medium armour (I don't believe a war should wear light armour...they weren't made for that :P).
when you reach 55 skillpoints in the war tree you unlock the possibility to get the skill "Light As A Feather" lvl that to 10 since it will lessen the negative effects for being encumbered.