I’ve had my 16x a few months. At first it was wobble city and I struggled to get to 20 mph comfortable. Now I can easily max it out and I wonder why I used to have so much trouble. It feels like a big gyro over 20 and gets really steady. It just took me a few hundred miles of practice. So I say keep at it with the 16x.
I weight 180 and ride with 25-32 psi. It is smoother at less psi. I do not use any pads and ride so that my legs don’t really touch when going straight. Remember the movie Contact? It was after her chair broke loose and she was no longer anchored to the capsule that everything became smooth.