I have had the cletio for several months and really like it overall but if I vape very long or chain vape for a short time I get a burned taste. I'm using the .4 coil, which is rated for 40-60w but I run it 30-38. I have tried using different juice ratios 80/20 70/30 60/40 all with the same result. My coils aren't lasting very long about wk to 10 days. Any suggestions?