.....how bad is it when you enchant armor to increase Two Handed damage?

Not that bad.

Also - all bound weapons have no weight, meaning you can deliver more power attacks.

Try reading more here

http://theskyrimblog.ning.com/group/character-building/forum/topics/character-build-the-arcane-warrior

Ironhand Gauntlets, Unique and Enchanted for a Players Headlopping Pleasure. I do notice the ease that My Bound Axe character has in Combat compared to My other Two Handed builds.

Gurder had a Ring of Minor Sure-Grip.

Found a Necklace of Major Sure-Grip and a Ring of Sure-Grip raiding Dungeons in the Pale.

The Game has a nasty habit of giving Fortify Items in Skills a character does not use. I believe My character somehow tricked the Game by being a Hybrid and not having Two Handed very high until after finding a Bound Axe Spell Tome