Anything lower than 420f, to me, doesn't cut it. I'm usually around 450-500f. I'm addicted to sweet bakery vapes and a warm vape. I like seeing how much gunk I can build up in my Lemo 2. I usually change the coil/cotton when there's a massive amount of black flecks swimming about in the tank.The number one coil "gunker" is the sweeteners used. Highly sweet liquids.....ahem.....icing flavor....ahem...... Will gunk coils up, there is just no way around that. But I wonder if setting temps lower then usual would help...say 280-290f