Charged weapons keep our class masteries maxed out.
The bar setup is a little strange due to slotted bonuses the Warden needs to take advantage of, but other than that the offensive weave is pretty simple to follow, albeit it takes a moment to set up so make sure your defenses are all up before going in.
Light Attack > Ele Sus > Bar Swap > Sub Assault > Contingency > Light/Heavy Attack > Wrecking Blow > Onslaught
Applying ele sus to as many people as you can will only make your leeching vines and mitigation via Green Keeper's Hide stronger, so spam away and keep those vines up at all times.
I chose bleed for contingency to apply slightly more pressure via hemorrhage, but choose whatever burst damage you prefer.
If you're having sustain issues still even with the tri-recov glyphs I'd suggest swapping out the frost staff disease enchant with a mag restore enchant so it applies the Overcharged status effect. Stamina sustain issues are tricky; either use another recovery glyph or throw in a heavy attack every now and then in your combo.
If you don't mind dropping the massive shield, Crit resists, and 5% raw mitigation Nibenay offers then I'd suggest using Maarselok for the insane burst since we apply a metric tonne of negative effects that will buff it to the heavens.
Have fun giving haircuts!