I use 2.0 ohm attys at 5 volts, and 3.0 ohm attys at 5.5. I also use 80/20 and 50/50 mixes depending on the juice maker. I think the darker juices tend to burn more, just my personal experience. Are you keeping those attys wet? I drip 4-5 drops in a BE510, and 6-8 drops in the ego mega atty...