It’s very difficult for me to judge if you’re having a legitimate problem with the vehicle or not as the feel of a CVT can be pretty subjective.
My oldest son has a Dodge Caliber AWD with the CVT. I’ve driven that a few times and never really noticed anything out of the ordinary that would make me think something is wrong. He lives in the mountains of Utah and that Dodge routinely sails through uphill grades at speed with no problems.
A slight gut feeling makes me think your vehicle may have a problem but that opinion is just a gut feeling, nothing more.
You might consider having a good independent transmission shop (NOT an AAMCO, Cottmans, etc) scan it for codes just to see if something is present.
Is there any way you can get your hands on another Jeep with a CVT and drive it for comparison purposes?
Also, did you purchase this vehicle from the same dealer where you talked to this service manager?