Make the post and I will go through it point by point. Your problem is you can’t get your head around the simple fact that air doesn’t do what you think it does. There are only so many ways it can be explained.
The very first video I posted shows what happens when you have a square corner on the down flow side. It’s as simple as that one video, but you shot on the video because the flow was too slow.
This is why I just said at the beginning for the OP to not even bother with port matching. It’s done wrong so much hat has become the de facto way to do it.
I can’t make you spend the time to learn. Learning is hard.