[universeman]

Sealant might be the way to go...my body shop just put in a new windshield and gasket and I think (but am not certain) that they put sealant in there - no leaks.

Are you sure you're tapping hard enough on the metal? It can take a lot of pressure before bending. The top corners are really important because water can get in there and then run to the bottom. If you're not focused on how the top corners fit, take another look. The rubber should be fully covering the gaps, with plenty of overlap (1/4" or more)...

Also try stuffing dry microfiber towels into the bottom corners of the windshield before the next rain, put some pressure on the windshield with the towels. If they're dry and no leaks into the car, you've found your issue. If they're wet you've found it also, and it's maybe worse than you thought!