Why run /W and not take Save Yourselves?
Faithful intervention is a gimped skill for a Dervish...if you want a skill that actually reduces damage go with conviction,,,
You have 3 Adrenal attacks on your build,, one is to gain energy + Heart of Fury which is also Adrenal.... Even with FGJ up you won't hit Your goal of your Adrenal TOTAL cost. and once it's down your basically auto attacking for next to nothing damage.
Might i suggest that U base your attacks and enchantments around a simple idea....When Adrenalin is low you should have at least 2 skills that cost energy that you can can spam to get adrenalin back up. And when adrenalin is up stop spamming the skills that cost you energy. This way as a Derv you wont need FGJ up at all.. and you could just play as normal.
I suggest you look here just for general ideas ..: http://www.gwpvx.com/Special:PrefixIndex/Build

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My " general" idea on how to improve this build would be....OgGjkyqKLSXFabYXIYWgTXcfxgA
( copy and paste too
http://www.gwpvx.com/Special:PvXDecode)