Well, before cleaning out the drains, I got a pitcher of water, opened the sunroof, and poured the pitcher of water on each side of the sunroof channels, basically more water than what a rain storm can provide. The drains in the front a-pillar and rear c-pillar were not clogged, they drained the water beautifully! Also, there was absolutely no water dripping from the a-pillar trim piece. The only thing I can think of is it probably is the windshield gasket. I can see in the lower left side that the previous owner applied silicone to try and stop a water leak. Maybe water accumulated in the upper windshield area then released when I started to drive forward at speed. The a-pillar trim didn't leak when parked, only when I started driving. Has anyone experienced this?

THANKS!