IMO big attys with big powerful coils can provide MORE flavor. But I find smaller attys and less power tends to provide BETTER flavor. BEST depends on the balance of MORE flavor and GOOD flavor.
Beer tastes the same when guzzled, but you will enjoy it more by the sip.
this is good advice. what inside diameter coils are you running? I would suggest you try a small i.d. set, like 2mm, if this is smaller than what you're using and see what your flavor is like.
some tanks, looking at my goblin mini, give better flavor than many (all of my) drippers (except the magma). your troll, however, can definitely be set up properly for decent flavor. I am like you, an efficient vaper, and mostly use rta's, but I do like building, so I've tried a lot of setups in lots of tanks and drippers. I really like twisted wire for flavor, claptons are great too, but twisted is super easy to make (claptons are easy with some practice).
I would suggest a simple 28/28 (7 wraps) or 30/28 (6 wraps) or 30/30 (5 wraps) twisted wire for a dual coil build with a small coil inside diameter (should be around .4 with duals and an 1.8-2mm i.d.). I believe you would find the flavor better than the subtank, and capable for flavor testing liquids. good luck!