No problem, tuning the kart is a complicated process with a lot of variables and even for veterans it’s not easy, so as a newbie providing the feedback needed to tune the kart can be tough.
It would make sense that if you raise rear ride height, it will increase the “hopping” you’re feeling, because the kart is transferring more weight. Hopping occurs when the kart transfers too much weight to the outside tire, the tire slips briefly and then regains traction before overloading and slipping again. You can see this at work with you slide a pencil eraser across a table at the right angle and it skips along the table. And this would make sense with your size. A taller or heavier driver tends to overload the outside tire easier when the weight is transferred. So lowering the rear ride height will fix that, but it will also make the kart transfer the weight less effectively, potentially causing it to understeer since it isn’t lifting the inside rear wheel. It’s about finding the balance between the kart transferring enough weight to lift the wheel and turn properly, but not so much that it overloads the tire. Ride height changes in the rear are fairly large adjustments with big effects on the kart’s handling, so it’s possible with that adjustment you are going from one extreme to another when you change it.
You probably need smaller changes to adjust the balance more finely.
The easiest things to try would be playing with front and rear track widths. Those adjustments are quick and easy and have very little side effects.
Also keep in mind that your driving can completely change the kart’s handling characteristics as well. Over or under driving the kart can have big effects on how it feels. With newer drivers it’s common to not be on the limit of the kart, not being smooth enough in their inputs, and causing handling issues that way.