Toughness, vitality and healing power in open world are wasted stats. 14k hp is already enough health. just run full viper and rely on evades and clones, you can run staff and axe/torch-pistol. And if you keep dying it means you are doing something not meant to be soloed. That is just flat out wrong. No idea why you would even say that. Yes Viper does more damage, but Trailblazer Mirage with Staff is unkillable. I'm currently using Exotic Trailblazer Armor and only 1 ascended trinket, rest is still dire. On Trash I use Axe/Torch and literally can't die because of Tormenting Runes. For anything tough I switch to Staff. I felt pretty squishy before using this build in some situations, now I only go down if I mess up badly or if I'm just surrounded by ranged mobs. I've been using this build http://en.gw2skills.net/editor/?PiwAc+ZlRwQYSMMmJW0P6vOA-zRJYkRHfZkTKkZF49sUl0G-e If someone just wants to do Solo Open World content without dying this is 100% the build to go for. It is very forgiving in most content. If you're in a zerg or meta-farm group, just swap out Axe/Torch for a GS with a Superior Sigil of Stamins, press V every 2 seconds and spam skill 1 to tag mobs. That fixes any issues one might have with tagging mobs in large zergs.
And you need at least 2-3 players for the event you want to do anyway. I don't "need" any players, I could solo the boss with eyes half-closed. I just can't get to the event because there's not enough time. And guess what? I finally managed to get a few people to help out and we did all the events including the Chak crown in a dead map instance. Elizia bugged out during her escort. I'm just about done with this game tbh.