Seems like the opinions so far are that it needs a little more flavor. That's kind of what I thought, but I wanted to get a greater consensus.
As far as using other kavas, I totally can, though it doesn't make a whole lot of sense to make it with the more expensive varieties, when we have great noble varieties, with similar chemotypes available that would allow us to sell it at a cheaper price.
@PsyGuru The paste consists of about 20% of a 75% kavalactone extract. The rest is some flavoring, a natural preservative, and an ingredient that helps with bioavailability. There's quite a bit of honey in it, and some cane sugar for sweetness.