122.62 vs. 52.55 damage, higher DPA, mag 3 vs. mag 2 stun. I can run an attack chain of Storm, Cobra, Crane and CAK with no gaps. I don't need a low damage filler like Thunder.
I don't have access to Mid's right now, but I thought he was already over the S/L cap without DR enhancement to RPD. I have no issue with the uniques.
I don't care about DP as a heal. I want it for the +HP. I rarely need to use it, but when I do I want to cap HP. Also, there's no need for a tradeoff - you can easily achieve both. You can definitely spend less than 6 slots on DP, but Preventative Medicine has some nice set bonuses.