I also suggest the OBS Engine Nano. I believe it ticks all your boxes and the top airflow is stellar with flavor for miles. I would also say the Geekvape Zeus is about to be released and is another single coil top airflow, but it has the Chuff cap you wanted to get away from.
Thanks!
I think I have pretty much decided on the Engine Nano as a "definite"; but am thinking about a second, if my budget permits.
The Zeus will have to wait, until there is 2-3 months of useful John/Jane Q. Public feedback, to be considered. I have "chased the unicorn" of new releases a couple of times and it has yet to live up to the hype. I will let braver souls do the reconnaissance and figure out what its idiosyncrasies are.
The Serpents (SMM, and Mini), Berserker, and Siren V2, have also caught my attention; but I have yet to make up my mind. The Kayfun Prime is looking interesting, but that one needs more time, to convince me too.
Right now I am trying to boil it all down to HIGH flavor, LOW vapor, and the least amount of "fiddlin" required.