Hi Jumma55
I always leave juice control to the minimum, even now with mtl post and chamber reducer
I build around 1-1.2 ohm and with 50/50 juice at 12-13 watts similar to your build.
Mtl post needs the chamber reducer and definitaly you will notice a stronger hit
Flavour is better in my opinion , and the draw is proper mtl ( well not tight like kayfun prime )
I dont like airflow control on taifun gt4.. and i dont think it matters in my case as always notice hissing when i close it down so i leave open at the mtl side
Also when you put the coil try to put it as low as possible, the chamber reducer is quite low and it touches slightly the sides when cotton rest .
Hopefully you will enjoy it , me personally very happy now and finally can build my GT4 with my favorite wires 28 gauge or even 30