From everything I've read, your probably drawing too slowly, which is the way you take your temp higher than the setting and combust it, especially if the coil is underneath the bowl as you vape. But mine hasn't shipped yet, so someone else can confirm
This is exactly your problem
@dompang drawing slower seems to increase the amount of heat reaching your bud. I've said it before and after talking with Joe he confirmed, that keeping a consistent draw speed is important for keeping your abv even. It's measuring the coil heat, not the air passing over your bud. So draw speed is one of the main factors in what temp your abv gets vaped at.
I had it at a little party on Saturday and just made sure to tell everyone to draw very hard on it because that's how I have it set up for me. Everyone loved it, but I did have one person combust at the end of a bowl because they didn't listen and pulled very slow. If you dial it in using the computer you have to test the temp at your draw speed, then keep it consistent if you want consistent temps.
Also
@Shit Snacks the coil is on top of the bowl when you hold it correctly to stop as much radiant heat as possible. Or at least that's what I figure
Also they have the screen replacement kits in stock, I've got one on the way with with an extra lid. Now one lid will have my screen for herb, and the other will always have an oil pad loaded
Now I will be able to switch from flower to oil by just dumping the bowl and switching lids
Edit -
@Sinclue I just heard back from Joe at ipuff, he said since the battery is controlled by a microprocessor it is totally fine to leave it plugged in all the time!