Let us know how your next few rewicks go. As much as I hope you have nailed it, I have a feeling it has nothing to do with the scottish roll and that you simply nailed the wicking in the channels. Seems like your previous builds were not wicking fast enough, giving muted flavour.
Wicking can be a bitch for some people, I've been doing it for years and still get unexplained problems. Right now for instance, I was testing something in the exocet bridge for the billet box, was running beautifully for an hour at 20w, chain vaping no problem. I put the device, down, come back later, back end of the first pull gives hints of a dry hit. Now I have to run it at 17w to avoid that. However, I was chain vaping it earlier, bloody mystery I tell yee.
Probably a culmination of things, grain, fluff, basically refining your technique etc....
(plus learning each tank's individual qwirks)
As for still getting the odd issue - totally agree
I have a number of same tanks, sometimes after a rewick it falls short of expectations...
changed coil, rather than reburn, rewick - still sometimes a little bit not as expected....
rinse out tank completely - yeah a bit better but say 3 identical tanks, 3 identical coils
same juice in all, still a smidge different at times, when they all seemed nigh on exact same before
(and yes all 3 vary from a bit old wick to new wicks, producing good flavour etc...)
But sometimes you re-do crap expecting it to improve & it's worse
WTF ??? - I mean they are similar after all that faffing about
but know only too well sometimes shit gets very weird
like a rebuild that comes out worse than a gunked coil
so we are all still learning this vaping malarky