Sounds like you're getting good results. Here's a pro tip, do six slow passes in each direction in every 18 x 18 quadrant of the panel. Also turn the speed up to 5 on the first few passes, then lower it to 4 on the last couple.
It's very rare that you can achieve an almost perfect finish with one pad & one polish, so If you really want to get the best results possible, get yourself a superfine pad for the final finish.
The Ultracut is probably not designed to be a final finish, so you'll want a different product to get the best final results. Looks like this is Carpro's finishing polish...
This will probably take your paint to a level you'll be thrilled with, but everything is a bit of trial & error. However, if the Ultracut is working well on your car, usually products from the same line will also work well.
Final tip of the night...That guy in that video is a bit of a clown...stop following his lead. The best detailing videos are done by Mike Phillips of Autogeek. He is one of the, if not the best in the business & really shows you how to achieve great results.