I had same issue/thought a few months ago. Still analyzing my setup to figure it out and so far all theories I come up with I find flaws. Example would be a juice that tasted great in a Kanger top tank with RBA plus head (2.5 dia coil, 28g ss316L, 6 wraps). Tried same juice in my Griff 25 plus, OBS Eng RTA, Griff 22, ammit, tsunami 22 RDA....and it was not so tasty. Note same wick style in all builds (Scottish Wick), as well as coil build just for consistent testing. Doesn't make proper sense to me since all other juices taste better in my Ammit, or Griff's....except for that one particular store bought one. All my home brews taste better in my Ammit and griffs and juice is always 70/30 6mg. My Kanger has widened juice ports on RBA so it wicks faster. The store bought one was a rare treat and it doesn't list the PG/VG ratio. It's not max VG, consistency seems around 70/30.
Only major difference between the Kanger RBA and the other tanks is the extreme short distance between the coil and the juice ports.
Do you notice better flavor on some tanks that have shorter wick paths?
Sorry...I work in IT so get paid to be overly analytical! If you didn't fall asleep after reading the post, let me know your thoughts as I am still testing my setup in search of the answer. Forgot to note, I used same mod and wattage for tests...Sigelei 100+ at 20 watts.