I by no means have great stringer control but I do work with several different torches. The Mega Minor is a nice torch for stringer control actually because it does not have near the radiant heat that a torch such as a Carlisle Mini CC has and I have found it easier to work thinner stringers with the Mega Minor.
Like anything it will just take practice with your new torch. Each torch will have different characteristics, learning them does take time. I have several Mini CC's and each individual torch is actually different. I am sure you will find the sweet spot with your Mega Minor, just give it some time.
As for turning your torch down, I find the Mega Minor to be pretty tolerant running a low flame to do stringer work and other applications like that. It does not seem to carbon up very easy. I would not recommend running it like that all the time but it seems to do fine with frequent flame adjustments.
I heart Yoda
Life should be hazardous to your health, if it is not, you are not living.
I survived the tsunami of ought-10