I use an A7 RDA with a stubby silica wick. I don't even drip it, I just "brush" the tip of my dripper across the coil a couple of times until the wick is saturated with my test juice. Gives about 3 good hits, plenty to get a handle on the flavor. In between tests, I brush plain VG over the wick and vape to clear out residual flavor. I just dry burn the crap off the coil until it eventually pops before replacing.