SH Perks Advice

These are the perks currently on my SH Lvl 4:

Helm: Rock, perseverance
Armor: Price of Victory, Dmg. Absorption, Predator
Weapon: Berserk, Shadow Berserk, Burn

What perks should I keep in all cases?
And what shall I change for generally different raids bosses and okay fighters?

If you can, please explain as well :)