How long has it cured for? I had this strange experience recently with a Mephisto Bubbly Blues. Grew it, cured it for one month, vaped it. Amazing flavour, but hardly any discernible high from it. Was gutted, tried several times, (Mrs Kushdog did as well) same result. About three months later I was fancying something light in the day so I got some out, vaped a little bit and flew very high indeed. It's now the strongest I've got, consistently. All this would seem to defy science, and yet...Cannabis is a magical plant. So maybe if it's relatively fresh leave it for a few months more and then try again.