Overload bar : caltrops, vigor, surge, expert hunter, thundering presence, shuffle, bound armament, even structured entropy, you have some choice.

You can use the werewolf form with surge, it's really effective, and especially if you have molag kena x2.

Stuff : the best stuff IMO is 5 hunding, 2 kena (or 1 kena, 1 bloodborn), 3 agility (jewelry), maëlstrom greatsword and master bow. But some piece are very hard to catch (master/maëlstrom weapons especially), so you can use something else like 1 kena and 2 crafted set item with critical chance (nightmother for example). Some IC looted set can be good too, and night silence can be useful as a ganker. All precise and divine.

Mundus stone : you should have more than 50% critical chance, so the Shadow will give you the most damage. Thief can be used to get more heal (one critical hit, one heal with surge, and wrecking blow/critical rush/overload heal are very good), but the heal won't get as powerful as with the shadow (less damage). Also, Snake can be used for extra stamina regen.

This build need more testing, it's mostly theorycrafting and PTS testing for the moment.