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If you're using Rockbear during the Damage Tally then it is weak to all elements despite it not being displayed so EPPR would apply here. Otherwise it's never really worth it on Dual Blades.

And...

PP Drink is a cheap way for +20 PP. Otherwise you'd want to affix more PP on your weapons and units while balancing out damage still.

Of course, just like any other SSA as long as the corresponding slot exists.

Assuming they don't make any new titles you would have it as soon as it is implemented. Otherwise, yes you'd need to do it again.

The new requirement isn't implemented yet. It was only announced.

You can get up to 10 as far as I've seen.