I thought that the Relics and Mythics kept their visible stats in the offhand, but lost Aftermath and hidden stats.
Thanks for your answer in general, but for a specific reply... Of course CDC is going to be your best weapon skill.
I'm still kinda sad that the Empyrean Club doesn't have a damaging WS. The WS it does is like SE suddenly decided that White Mage was going to tank someday. I don't suppose you are an expert on White Mage melee too? I could use some number crunching between Mjollnir and Gambanteinn... actually I'm off the the White Mage forums to ask.