Tonic, Part II of XXIVIXDMXIV

In an effort to improve on the tonic water I made, which was barky, I tried a couple of things. First I re-filtered it through another coffee filter. This didn't seem to make a difference on either the flavor of the tonic or the resulting barky coating of my tongue. Then, since I had a Britta filter that needed changing anyway, I used it to filter some of my tonic syrup. The resultant liquid was thinner (less syrupy), lighter in quinine taste (in a good way), but also losing most of the citrus flavor and sugar (in a bad way). So that was a failure as well. Should I try again, I think the recipe could use less powdered cinchona bark, and perhaps I should try making a tea bag with it in the first place rather than putting it in raw. I also think it could use a few other flavors to make it more interesting. I've spoken with the Fever Tree people, the Q Tonic Water people, Todd Smith of Bourbon and Branch, and Jeffrey Morgenthaler about their versions so I have some ideas. For now I have to go finish my story on what the pros are doing before I continue my amateur experimentation.