I grow and make tinctures from CBG but I use the decarboxylated flower and the effects you are describing are spot on with what many people I provide it the tincture to have experienced and use it regularly for.  This is anecdotal and perhaps even a bit non-sequitur to the OP but thought I would mention it in case he/she wanted to experiment further in that direction.

I see CBG products becoming more and more common at CBD dispensaries so it shouldn't be hard to find.