Tonneau leaking a lot!

Hello everyone! Hope this is posted in the correct place.
I'm a first time truck owner and brand new to Tacoma World.
Have a '24 Tacoma Limited Hybrid. 9/24
Installed an Extang Endure ALX Tonneau myself. (same look as MX4)
Rain has finally hit us here in Western New York and I have leaks! Snow soon!
I realize this can happen but its significant on both sides/walls of the trunk bed.
Can also see light in both front corners....
Customer service at Extang has been great and they sent me a new cover.
Asked me to run by a local dealer who told me it was installed properly.
He didn't like the small tubing and said they would shim the rails to firm it up.
Should I switch to a different Extang or have the dealer install the new one?
Anyone with Tacoma's with tonneau's that keep the bed dry on the '24?
A number of threads say some water with covers and others completely dry.
The flat cover is for security and a dry bed would be nice!
Attached a couple of pics but the recent day of rain is more then you see.

 

Got pictures of how it is sitting from the outside?

 

JB, Hope this helps!

 

I have a Factory installed cover on my TRD Pro. I did get a little water on both sides near the liftgate, not much but a little. Only had it a few weeks so keeping my eye out for more water.

 

All tonneau cover leak. Never had one that doesn't.

 

I've never cared enough to try and seal by the tailgate.
A good weatherstripping always kept my sides leak free.

Another thing I've noticed is the channels on the bedside and tailgate caps, direct water right toward the tonneaus, instead of down the outside of the truck.
It isn't helping.



My 2016 with melting snow/ice is even worse for inviting water in.