I don't think it will be better than Monarch Crab for EH. Yes the time will increase but because of the cooldown it will be a non-comparison to the static health of the crab.
The Crab also grants a nice avoidance on use.
I loved the Talisman... Pop talisman >> Shield Block >> shield slam >> devastate/revenge until SnB proc >> Shield slam.... and you should be set on threat for awhile.