So. A full day using this tank and having a tinker. I like a tight draw and this is a mtl tank but I encountered the same limitations as Klaus Jedelsky did using the 1.8mm centre pin. Shutting airflow to where I like it causes an annoying whistle and the vape gets too hot for me. I had vapers tongue last night for the first time in years, so today I tried the 1.2mm pin.
That pin works set to tight without squeaking or whistling. I tried it from full open to nearly chocked off and found no whistle. Still a warmer than desired vape though so I changed my coil. From 28 gauge, 2mm id, 8 wraps, I just went down to 6 wraps and it's working well. Klaus went down to 30 gauge wire but I will likely stick with 28 gauge.
So 28 gauge, 2mm id, 6 wraps, circa 1 Ohm and vaping lovely between 11 and 12 watts. Flavour is abundant and I'm set as tight as a Berserker mini 1.5. Currently vaping FA RY4 Nutzila. Very nice indeed. I like it. It's a flavour monster.
I'm confident this rta can sit side by side with my Berserker minis.
Here's Klaus describing the same issues I found and how he fixed them.
Consider using a different drip tip. Those stock steel ones get warm.