i rarely use it, and this is the major weakness of physical doram - the lack of aoe skill.
the long cooldown and lack of damage just doesnt cover it up...
im not so sure how long is the cooldown but it says it is up to 20 secs? as per: https://www.limitro.com/forums/reportcenter/skillbugs/spirit-of-savage-cool-down-and-hits-r1637/
you can reduce it by using the race cap - (this might be the tips u r looking for)
but to be perfectly honest i still prefer to use my laser of eagle because of the cecil proc.
Lunatic Beat carrot can only be good if u use the entire elegant set - i still can hit 70-100k (? - i guess )without it, but it is a 'meh' damage.
the best way for tanking, use 'STOOP' and spam picky. XD