Advice on replacing Tonneau cover

I got a Tyger T3 soft cover for my 2021. Upon installing it I found that the corners seemed to sit a little high, so I installed squares of extra weather seal at the corners. The next two days we had some good rain and quite a lot of water leaked into the bed. It appears that it came in through the front corners and from around the forward hinge. I also noticed tonight (we had the rain two days ago) that the underside of the cover has wet spots on it.

The T3 gets good reviews but I'm unimpressed. Due to the fact that the clamps are all made out of plastic, I didn't tighten it down super hard (though not super light either). Am I expecting too much out of a soft tri fold, or should I spend an extra hundred or so to get a Gator or something else? Has anyone else had the T3 on a 2020 or later and found it to be leaky?