Ive posted this before but my HR change is that a Wielded shield (not animated)
gives the same benefits (but does not stack) with 5 ranks in tumble:
fighting defensively gives you +3 ac, -4 to hit
full defense +6 AC
This is based on my untrained fighting experience, that actively hiding behind a shield is
a - easy, b- helpful. I also allow published shield focus feats, but its not like it takes a lot of training (or brains) to block with a shield,
it is much easier than any other fighting style.
and I was one of the objectors to the 2 for 1 CE, it quickly makes unhittable PCs
3rd lvl fighter fullplate+1, large shield AC 22 vs 28
with a 2:3 rate it might be better, but it only helps really smart fighters