At night, take a flashlight on the inside and shine it into every seal you have on the super slide with someone outside watching for light to shine through.
When you are standing outside looking at what appears to be the seal is actually nothing more than a wiper seal. It wipes the water off of the side as it retracts in. the actual seal is against the interior of the slide and butts up against the wall. It may just be a simple slide adjustment to get the slide to extend an 1/8 or 1/4 inch to make the seal. You can't caulk those seals, and since you have caulked everything else, I'd put my money on the slide seal. However, water does seek it's own level and it could be coming from somewhere on the roof.
JMHO
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