Assuming it is an air leak somewhere, how do I seal the carburator? Just pull it off and smear the RTV silicone on the side and put it back in? What about the backplate? Just a bit more detail please.

It seems from your temperatur range that I did not get too hot, but if I seal everything and the issue still continues, what should I be richening up, the low or high end? I am thinking the low end since it won't come back directly to a low idle, is this correct?