Hey there…
I am having a blast with Dual wielded Jelkhors as @Travoas mentioned…
I have however been messing with it on a level 90+ Marksman as part of theorycrafting - so I am not sure how it would work at level 56. The key is that you really need two of them… one on its own isnt that great as you cannot get the additional skill nodes easily without the +6.
From your post, it seems like you are suffering from the usual defensive challenges with Rogue - especially when using Dodge on its own. I solved this using the Foot of Mountain boots to convert it to being a primarily Endurance defense when standing still in the middle of the mobs. Dodge & Glancing blow becomes secondary. I was not able to get this build to work with Dodge because you either take no damage or get hit for a ton with just dodge… pure Glancing blow helps, but its not enough on its own. Endurance & GB together work really well in keeping you alive long enough for the massive leech to kick in.
Not having any problems with Detonating arrow as to dps - I went the full lightning route and am using suckerpunch to proc crit explosions that wipe anything close to you.
The only problem I have found with the build is the targetting that plagues all LE skills - you have to aim at the base of the mob models - especially the floating ones - else you just dont hit… And you need to tap tap the key or mousebutton because of the way LE doesnt move you to the next melee mob if you hold down the key/button. (annoying).