Advice for berserk barb?

[chris]

Trying to transition a WC barb into a berserk barb since it seems like noone is trying it and it looks really fun. Obviously this will probably be a lot better when the damage cap is fixed but,

I have about -92% enemy magic res with lazarus gloves, mermans, dual natures peaces and an echoes of arreat and do about 12k to 47k magic damage

The stamina never seems to run out when it hits 0. It just seems to go back to full. Also seems like it only sinks when the no damage chance buff fades away but sometimes it goes down anyway.

Does magic damage work on melee splash? It doesnt seem to but not 100% sure.
Do critical strike or deadly strike increase the magic damage or only phys? Can't tell if some of my blows are going over 87k damage cap or if I'm just weak.

And finally are there certain pieces of gear I should be seeking? Is the grandfather probably the best sword for this if all the magic damage scales off my physical?

And keep lightning a3 merc or get one of the a2 auras?