None of the tanks that are built for direct inhale won't give you good vape if you lower the power and try to mouth to lung them.
The thing is in the airflow. If you want a nice vape for mouth to lung, you need to have a atomizer with a small air hole on the deck, so once you start pulling air gets some speed when flowing over the coil, thus cooling a coil a bit, pick up all the vapor produced on it and directs it towards your mouth.
On the decks like Subtank's, where you have a wide bore airhole sitting below the coil, here's what happens:
You set the airflow to it's smalles setting and start taking a mouth to lung pull. Air is restricted at it's entrance and i'ts getting high starting velocity, but as it travels toward the coil it gets more and more space, it ekspands and slows down. By the time it gets to the coil it goes so slow it doesn't cool of the coil almost at all, and then picks up the vapor that is too hot in that moment and slowly directs it toward your mouth. The result is a huge condensation from hot coil and a cold air, extremely low amount of vapor with artificially strong TH and flavor.
I have done couple of modifications on Subtank RBA heads and the best one for us, regular vapers is if you go online and buy a ceramic cup for a Killer 705 or similar atomizers that are using same small ceramic cup for coil setup. Take the cup, and slowly rotate her and push into the air hole on the deck. t is a bit wider diameter, so you have to go slow and rotate so the outter part of the ceramic slowly wears out as you are pushing your way. Once you've pushed it all the way down, the top of the cup will remain on top of the deck. Take a screwdriver small enough to fit wick insertions on the cup, put the screwdriver in it and quickly twist it. The top of the cup will break off, leaving you only with the part that is in the air tunnel of the base. End result is about 1.3 mm airhole, perfect for MTL, and THEN you will see how Subtank performs with MTL style of vaping

I'm running mine with mesh build currently, once i'll have to dry burn the coil, i'll take some pics so you can see what it looks like
Any other tank that haves a huge air intake hole at the base can be modified in a similar way for those that like MTL but also like the way the tank fills up and looks...