Kanger subox mini burning coils

[stefram4]

im a new vaper and was suggested to get a endura t22 by innokin, for the first 5 days it was great. Then I was burning though coils every other day. So a friend lent me a extra kanger subox mini and again in 36 hours I burnt up a 1.5 coil and a .5 coil. I went into the local vape shore to buy more coils and the sales rep helped install to make sure I was doing it right. He put in a .5 and said that it was reading as a 1.0. And that the box chip was starting to go.. So. I was left with buy a new one (and I was going to anyways just wanted to test my friends first) or go back to smoking. So I ended up buying a new kanger subox mini. Put a coil (Saturday night) in and I was tasting burnt within 36 hours (Monday morning) I did prime it, I did let it sit for 30 min and started the watts off low (7) working up over time. I don't vape over 29 watts and the juice I use is a 60/40 mix. Any help advice or idea of how I can make the coil last longer. As $5 plus juice when I now have over $200 invested in mods isn't really in the budget. I really like vaping but getting very frustrated with the coils burning on me. (And I don't chain vape)