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I don't think you are crazy, Overload with 4k+ weapon damage hits like a truck and crit rush + crit surge is a nice combo for pvp. But why undaunted infiltrator? Why not a set that actually increases your weapon damage like hundings rage, ravager, morag tong or ashen grip?
Also is 2H a must for a stamina sorc since the crit rush is a for sure crit/heal? Or is dual wield and bow viable too?
and i just figured since the undaunted infiltrator set gives bonus to weapon critical plus boosts weapon light and heavy attack when using a magicka ability ( crit surge, lightening form, bolt escape )