Kanger Subtank - Occ Heads Problem

My first .5 OCC coil only lasted 3 days . I put my device up to 25 watts and it totally fried it. A terrible burnt hit. I backed it back down to 20 watts and it was fine for a little while, but then another bad burnt hit. Down to 15 watts and I literally sucked hot particles in my mouth when taking a hit. ...? The cotton and/or coils are literally breaking apart? That's totally gross and I can only imagine, not that safe.

My second .5 OCC, I never put my device above 17 watts, keeping it at 15 watts for the most part. Within 4 days, same thing ... total burnt hit one day, sucking up hot particles the next?

What's going on? I thought I was supposed to be able to hit a .5 coil up to 30 watts ... Is sucking up hot particles from the coil normal? Should I just keep it at 12 to 15 watts and that's it, taking 1 to 2 second drags and that's it? Is it just a string of bad coils?

Thanks

EDIT: Thought I should mention that the juice I used for both coils was 50/50 watermelon. I hear it's better to use higher VG liquids with sub ohm tanks. But can that be part of the reason why the coils are being fried so quickly?  


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