You are most likely running at too high a voltage. The Kamry is a mechanical mod without regulation. You can adjust your ego, I assume. IMHO, I would not run a tank on a mechanical without a regulator like a kick or crown. That is a low resistance head, so you are most likely running at a significantly higher wattage than you did with the ego. Based on a fresh battery, you are running on about 9.2 watts. I run my devices on no more than 8 watts. Here is a calculator that might be able to help
Ohm's Law Calculations With Power General rule of thumb is that you want to run your atomizer at a voltage that is two times the resistance. A 1.8 ohm coil would run at about 3.6 volts. A new battery in a Kamry should be around 4.2 volts, too high. The Kamry really isn't meant for BCCs, it is more suited to RBAs and RDAs. Hope this helps, good luck and have fun.