Just from the OP - I was guessing the neck had a bit of back bow... Strings are on the frets all over the place.
Wait a couple days and see how things settle down. You will probably need to tighten the truss rod back up a little to dial in your neck relief. Necks can take some time to react to the string tension and take a little relief like they are supposed to have.
Once the neck relief is right - if the strings are too low you may need a taller saddle.
If the neck set is out of whack - send it back to Gibson....
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