just put together stuff synergizing itself, had to make a couple of choices but i think the skeleton is there. Everyone free to jump into PTR and try it.
Couple of details: vengeance grenade rune is not affected by HW, so we can stick with dark heart and gunes is not needed, until Seethe is mandatory and basically break the setup. Grenade for the hatred regen and F/R procs to make use of HW again. Nat xbow/Dawn are mandatory, choosen ballista due to great increase on toughness provided which the spec lacks. Standard complementaries (yan, channeling, clarity).
EDIT: Spike traps are bad becuse the mechanics are utterly bad. Only real working rune was Stick trap and it got removed for no reason at all. Imho they should make sticky trap baseline with old 1h xbow power and then run change damage type/add effects. The you'd have a reliable aoe damage source.
I tried M6 ( with garwulf ) and i got sutck in 75-76 grs. BUT the build, i think, is very good for groups (cindercoat), the damage is decent ( 70 - 100 bil EACH final grenade ) and if cluster bombs the damage from the lesser ones is 20 - 30 billion if you sum all of that and the effect area of it, its a pretty decent damage dealer.
if you go with travelers + convention, the damage on the element is insane.
not for the ultimate rift pushing, but decent for a 90+ maybe.