I am level 163, Hybrid Build (Roots Touch Bark Embrace Vines Strike), with 105 sigils and my only regen being the focus offhand, and I never run out of energy while duoing, and if I use a normal Energization Elixir I rarely run out of energy while soloing.
Some advice I would give while duoing is:
-Keep bark on (decreases damage dealt to partner, allowing you to regen more often)
-Know your partner's maximum HP (If your partner has 3k max, heal him/her when their hp is at 1/2)
-Embrace+Bark works wonders (while leveling on the Wyrms, with bark they deal about 90-150 damage to a rogue. If you keep them embraced and bark, you will have about 7-8 sigil ticks before having to recast/heal)
-If you have to DPS, use Vines (Vines has a moderately low energy cost, high damage, and lasts for the entire mob)
And some soloing advice:
-Keep Bark on (Less damage to you = less healing = less energy usage)
-Only Root once (37 Roots cost 377 energy, while 35 touch costs 200. Would you rather not get hit but loose 177 energy? Or get hit and save that energy. If you have bark, merely healing yourself afterwards should be fine)
-Level 1 touch is UNINTERUPTABLE (If you are going for a pure soloing build, lvl 1 touch may do the trick. Using touch charms and such I got my touch to 505 at level 1. Thats 505 HP every 10 seconds.)
I know I am a nooby level 163, but I hope this advice helps
