Alright, so last night I was leveling up my Pally Caster, and was using the following armor at level 10-15 or so (yes I could get better, but it works)
Rare hard leather armor
Level Req: 10
Defense: 7 to 22
+19 Strength
+12% Heal Mastery
At about level 16 or so, I found this:
Angelic iron plate mail
Level Req: 5
Defense: 18 to 54
+51% Enhanced Effect
+2 Mana Regen
+1 to 3 Mana per Attack
+1 to 3 Mana per Kill
I figure, it's probably not worth much, but grabbed it anyway. Once I leveled, I thought, heck....why don't I equip it just to see what happens. Know what happens? My damage dropped about 20, but my MCC increased due to the increased defense, and + Mana per's. I didn't realize that it would have that much effect!
I also noticed this on my last climb as Sammy Caster:
I was have a choice of two armors that I own for level 25:
Mythical embossed leather armor
Level Req: 25
Defense: 11 to 35
+20 Strength
+1 Mana Regen
+1 to 1 Mana per Kill
+1% Damage Return
+19% Heal Mastery
Angelic elvan padded robe
Level Req: 25
Defense: 0 to 23
+15 Strength
+23 Dexterity
+1 Critical Strike
+2% Magical Damage Reduction
The results I noticed were that I took less damage with the Robe, and dealt about the same damage with both. I had expected to take less damage with the Leather though. I am guessing this is the +dex and MDR working. Perhaps it was all luck lol. Once I hit level 25 again, I'll have to compare the new found Plate with the Robe here.
Just thought I would share some personal observations...hopefully it helps someone.