Guild Wars 2

Hey guys, I am a relatively new player who has been getting into solo or small party (up to 5 player) roaming in WvW. I find bomb and grenade builds pretty boring so I started digging around forum posts here and elsewhere for builds that do not involve bomb or grenade kit.
So far I have been using a standard zerker static discharge build which is fun for bursting and big numbers, but it is a one trick pony and can easily be counted. I read up on a couple of HGH builds using dual pistol and I gave it a go in the mists and found it enjoyable.
Browsing the forums today I found the topic about Incendiary Powder being strong in a 1v1 situation, a couple of posts down in the topic someone mentioned coupling it with the 100% crit on swap sigil as they basically have the same cool downs. So I decided to have a little play around with a build and I am not sure if it has been posted before or if it is in mainstream play but here it is:

http://gw2buildcraft.com/calculator/engineer/?2.1|a.1b.h1g.a.1b.h9|0.0.0.0.0.0|1b.712.1b.712.1b.712.1b.712.1b.712.1b.712|1b.9b.1b.9b.1b.9b.1b.9b.1b.9b.1b.9b|a5.u67b.0.u28b.0|2s.d|2b.2g.2k.2v.0|e

I took the elixir gun for a bit of mobility and support and for the “on weapon swap” sigil proc. I would be grateful if you guys would take a look at my build and maybe point out its flaws or things that could be changed to make it viable in WvW. Thanks.