yeah most of the "issue" i see is CD usage. Jugger hc. 2 AMS and 2 DRW over a 5.58min fight where you could of used 4 DRW (suck at math head hehehe) and 8 AMS atleast with glyph. consider its a heavy magical fight you almost wanna use AMS asap u can.
but yeah. work on that CD usage and you'll be Top ace!
regarding 4 set. i just dont see it worth having. im raiding 10 tho and not 25 so cannot speak for 25man. but ive tried it a few times but i gained more dps on having d/p items from heroic than 4 set.