I do the same thing. Blueberry muffin + waffle = blueberry waffle (duh)
Polar mint + janty gsm (some kinda
tobacco, don't remember what it stands for!) = tasty minty/tholy
tobacco
vanilla + waffle = good
mimosa + mint chocolate cheesecake = yuck, I'm not doing that again!
After doing the don't wash refill with a different flavor and liking some combos, I'm now mixing right in the carto, 10 drops of bacca 1-2 of mint, repeat till full. The flavors mix fine this way and i don't commit to a big batch of a bad mix, in fact you can tailor the mix after just a few more puffs by dripping in whichever flavor you need more of....