I am a tank person too. When I was still using tanks that had drop-in coil heads, like you, I tried dedicating specific coils to specific flavor profiles... it didn't last very long.
First;
I am LAZY! And, because I tended to mix a half dozen (or more) different recipes (I was trying
everything when I started), I didn't like having to constantly tear apart my tank with each recipe change.
Second; it's messy. Handling those wet, used, coil heads, over and over, did not work for me.
So, I tried using an RTA. This was much easier (all I had to do was re-wick between flavor changes; but it didn't give me the same flavor perception. Even with the same build, there were just too many variables to get the same experience as my tanks. It was okay for getting a very general idea if I liked a particular flavor/recipe. But, it was pretty useless to dial in best percentages, or recipe tweaks, that were best to my tanks.
My answer was to run some plain PG/VG (no flavor; no nic), mixed at my normal ratio, through my tank between flavor changes. This worked well for all but the strongest flavors (I think I still have a coil head buried in a drawer somewhere; labeled "absinthe!"). For those; a coil head change is about all you can do.
Even though I am using rebuildable tanks now; I still use "plain" to transition flavors.
There is nothing saying you can't follow one flavor with another. Some actually like the novelty of the transition of tastes. Some even find inspiration for new recipes this way. The downside, if you are testing new flavors for the first time, is to know what is the influence of the new liquid vs. the previous liquid.
Using the plain unflavored in between helps to return the coil to neutral taste. It even
seems to help reset my taste buds. It doesn't often take a lot... maybe a quarter of a mL. (When I am testing a new flavor; I generally start with only ¼ to ½ mL of the flavor. Often it isn't ready/needs add'l time. or, I simply don't care for it.)
You may, like me, even find that you enjoy unflavored. So now I include nicotine, and it currently makes up 80(ish)% of what I vape.