Crafting is awesome in this game but really ill-defined and any thing to make it moreefficient and easier to use as well as improving the results is a must. Loot mostly sucks so improve the crafting.

I am not in favor of cutting skills, some ( especially spells) you just dont need. 50 Slots in the skillbars is plenty for my uses. I usually focus on all 5 schools of magic but never get beyond level 4 in any and that works well, 9 spells per college gives you not every spell but all the good ones.

Food and healing potions should be changed, those suggestions seem acceptable, duration on the food and %based on heal potions.

Yes more tank skills are definately needed, I think some ( maybe) should be re-worked as well.

Taunt, is a good idea for sure.
Martyr, is a really cool idea, I want to try that out.
Rage, shouldnt cripple the user as much as it does, it is not worth using usually.
Melee Power Stance, should either cost 1 action point extra per strike or -10% to hit not both.
Another "spell-like missile attack" like crushing fist but different or allow a Man-at-arms to use that really weak bolt attack that can only be cast if using a staff, honestly that is a weak ability, no Man-At-Arms worth his salt is gonna use a staff anyway so that is a useless thing to give them, but if they could cast it out of their Sword or Spear that would be kind of cool, still weak but far more useful.