Build Up Heat and Angles

A couple of things talked about multiple times.

The concept of Build Up Heat.
where do you want the glass hot. Do not get the whole thing hot. Build up the heat into the area where you need the heat.

Angles
If you angle down the glass moves back onto the punty
if you angle up the glass moves outward away from the punty
upward presser on the lip from the inside - glass moves outward
inward pressure on the lip from the inside - glass moves inward.
Moving in one place causes the glass to move in another place.
Physics - Equal and opposite action