I have a Billow v2 and a smok tfv4 with different rba coils. The best result is v2a double coil with .2 ohm 30 - 40 watt on a wismec rx200 or a Tesla d2 dripper with the same coil setup on a Tesla invader
I change the wattage every day and the wick all month. I think the solution is the "Fluidmatrix" of solvent and thc, combined with TempMode and powerfull wicks.
I dont need a special technique... the Ethanol is good for the Fluidmatrix of the E-Juice (PEG400/PG + a little bit Ethanol) ;)
First i make a solution of 96,8% Ethanol and hash. Cooking at 78°C for 10 min, 60 min at freezer and filtrate to a coffeefilter. Then cook again (from 30ml solution to 2ml), mix it with a 50/50 Mixture of PEG 400/PG...take more PG for better measures.... Now you have 10g hash in 30ml THC...
My setting:
1. Diy THC Base (10g marocan hash to 30 ml PEG 400/PG)
2. 70/30 PG/THC-Base + different aromatic drops (1-6% Kryptonit II)
3. wismec rx200 + smok tfv4 with dual coil rba with kanthal and JP wattage
4. 40w, 3,56V, 0,31 ohm
5. all 3 tanks New wattage!
Go :)