Hi David.
I don't like the null for the ik setup, I do like using them, but they seem too large, in my setups I use smaller ones. I know the you are keeping it the same size of the hand, but I had no problem with the way you had it setup before. I like the fact you got rid of the ik elbow control, this is how I set it up in my rig. Is there a reason for showing both the bicep and the forearm, you can use either one to adjust the elbow (is it for keying for the switch). And the last thing, it's a request, I think you should add a hips lower control home, like you have the chest control home. Having a reference point for the hips lower control will make it easier to set back to original position, since it does squetch.