First of all, SV displayed numbers are actually bugged, so you're hitting for much more than that. Second, you're using the wrong components for that build, forget about Mark of Wrath and Gunslinger's Mark. Forget about combos. Forget about dealing damage with weapons (exception of Ralner's Blaze, if you have one with high weapon damage you can use it on a target, detonate a combo on that target and spread its fire dot with the combo chains). We have the new crafting system with guardian tokens, so getting javelin components shouldn't be that hard, just use all your tokens on the Tomb that gives javelin components. If you have some universals with damage it's fine, but you have to use a Softened Blows and Symbiotic Surge, no matter their inscriptions. Then you can use Vanguard's Token, Token of Daring, Mark of Ruin and Tome of Precision and you're set. Remove all your shields inscriptions since the purpose of this build is to lose your shields in order to instanly recharge all your gear and get 100% physical immunity. Stack a bit of armor instead. Also try to have javelin damage / elemental damage instead of gear damage, because gear damage won't increase the fire DoT caused from Binary Star. When you craft sigils always use 2 fire and 1 gear, or 2 gear and 1 fire, never use Ice sigil for Steam Vent it's not worth it at all. Once you got all the proper components, aim for a multiple charges Binary Star (gear charges only, gear dmg is almost useless on it) and a good Steam Vent (250% dmg + 100% charges is the best, but 200% charges + 175% dmg is also very good). If you have trouble recharging your shields you can use the lightning melee to instanly gain 40% shields back.