I'm not going to argue flavors as reg/unregulated when there are way too many variables. I got way more flavor and smoothness from my Steampunk Nano 120 than I did my IPV-5. It's a better mod, I actually had to turn my wattage down, and my airflow down. I have NO CLUE why this may be the case, but I don't think even two of the IDENTICAL tank/mod setups vapes exactly the same. I have one Nautilus 2 that vapes at a slightly tighter draw than my first N2, even though EVERYTHING else is the same. Storebought coils have slight variances in ohms, for example. That's one reason to prime a new coil by going slooowwwllly up on the wattage until I hit the sweet spot with power, airflow, and coil.
You might try looking at it as: a variance. You could try more flavoring in a tank you are going to use in a regulated mod, for example, knowing that the benefit of a regulated mod/tank is that it's far more portable than your mech mod is going to be, and accepting there may be some flavor differences. Or, use only CERTAIN flavors in your regulated mod, others in your mech mod, so that you will adjust. Trying to "identicalize" flavors is a waste of time, in my opinion. You may WELL get a better flavor/flavor that suits you out of a mech mod for the rest of your life, for all I know. I certainly know that there are tanks/mods I love far more than others, though I can vape all of them....
I'm merely pointing out these options as you may be inadvertently on a quest for the holy grail, unless you want to cart a mech mod everywhere with you (I personally would not want to do that, and if I ever need a mech mod I will set my husband loose on the task, I am CERTAINLY not doing that) and vape it only if all my other options elapsed. ALL my options....
Anna