about Cloaking Device, i've noticed in the description that it grants +DMG. i don't know exactly how much dmg it boosts but i have noticed an increase in my killing speed since taking Cloaking Device at lvl 22. it could just be that i started using SOs at lvl 22 but who knows.
about Trip Mines, i like to use them against bosses and mobs in general for fun. in Guild Wars, Rangers are often used as "Trappers" where you lay down different traps and pull a mob over them to kill a large amount of baddies all at once. what i do with trip mines is lay a bunch of them down by a corner and then pull a mob and run around the corner forcing the villains to activate the mine... it's pretty effective, if you're willing to take the time to lay down the mines. i just barely got Trip Mines and i only have them slotted for 1Acc, 2Recharge but they're still pretty effective without Dmg slotted yet.
for fun you can lay down Trip Mines in a social area to create a club feel for people to dance around...
about Targeting Drone, besides that awesome +Acc it also boost perception and gives resis to AccDebuff...
it just makes that power even greater.
i'm constantly running Cloaking Device and Targeting Drone while playing and i never have trouble with Endurance.
i've never been able to get into playing a blaster before this, and for a while it was frustrating, but now it's one of my favorite toons. the ability to play different ways and adjust to any situation, which Archery/Devices allows, makes up for the lack of pure Dmg... IMO
