Tempered Will: A3S says hi. Literally makes the knockback between the hand splits so easy. Your OT doesn't have to run across the arena to pick theirs up, and you don't get pushed in random directions which can be make or break for the hand of prayer/reach mechanic. Can also be used to maximize dps uptime for you in lots of fights. Tempered Will is situational, but very very powerful.

Shield Swipe saves you so much TP while you are tanking. Don't care much about the pacification if it means I don't need to beg for goad when a dps could use it more.

Shield Bash: Again, A3S says hi. Only thing I would change is make the TP cost lower.

I also agree PLD seems to be lacking in magical mitigation comparatively. We rely a lot on physical blocks, which aren't as useful in some fights (A1/4). However, I think Sheltron is a very strong CD considering everything is timed you can always block a physical tankbuster with proper planning on your part.