The herb should only go in the mouthpiece stem, never in the inlet side (unless you are going for combustion).
I am thinking the air flow is too restricted or too low. Are you sipping? Is the load packed too tight? Is the herb too coarse? A fine to medium fine grind is needed so all the herb forms an even pack. Tamp it very lightly, just enough to keep it in the stem. The air flow should be free. If the screen is clogged you will need to clean it. When you hold the flame at the inlet and draw you should feel the heat, if you don't draw harder. As Snacks said draw as you hold the flame at the inlet.
I am out of town for a couple weeks starting this Thursday but if you want I can do a skype session (or whatever platform you like) with you and walk you through this. If you decide the Essence isn't for you I would be willing to have you return it for a refund. I want everyone to be happy with what ever they get from me so I'll take it back (
@Vitolo can find a good home for it I'm sure).
That said I would really like you to a least have a good session with it, I was skeptical of butane vapes but after trying the Sticky Brick I realized they have enormous potential. Which is why I created the Essence, not to try and best anyone but just to see what I could do with the technology. I think the butane vape has the potential to provide hotter vapor without combustion, the electrics seem to have a harder time hitting the sweet spot. I get amazing extraction with the Essence.
Let me know, anything I can do to help I will do.