Venom support Thief
Thank you for this tip,
Also I’ll leave something I came up myself up for comment:
http://gw2skills.net/editor/?fZAQRAoa8YnMJSVT21E2NB7TmImQ4e3vea3YRguqC-TpxAwAdOBAkLDwb/BAHEACPAAKHBAA
The idea is to shut down an enemy every 30sec with ambush and use both venoms while ambush thief is up, in 10 interval, and of course to really tip the scale when thieves guild is up. Stealth is the tool to remove conditions and squeeze a cheap blow here and there.