A Phoenix rebuildable atomizer and a dripomizer for testing, those have really the best flavor
Phoenix has a hybrid SS mesh/silica wick
And I just test on whatever ego battery is full at the time, but If the flavor is uber, then it goes into a stardust or just ego-c tank or so
Tobacco's I prefer in a boge 2.0, so a later test is in a cleaned carto. I reuse my carto's, but only 1 or 2 times to test a flavor in it. When the carto isn't all that anymore i just boil a couple of them let them dry for a day or 2 and then the week after I use those for testing