I think that you could get it much higher but I'm not sure of how good you are on a rotary. Final result is 99% technique.
The polish you used has a lot of fillers. It makes bad technique look good for several weeks to several months. Then the paint will start to revert back to its previous state.
Also judging by the holograms present in the after pictures (considering the filling nature of the product) that you are pretty new to a rotary?
I think you could really make that paint look outstanding but I would strongly suggest using a dual-action polisher like a Porter Cable 7424 with Lake Country's Orange and White pads and Menzerna PO83 and PO106ff. I really think you could blow that paint through the roof.
Alteranitvely you can produce similar, if not better results with your DeWalt but would have to invest a lot of time in perfecting your technique. Either way this forum is a great place to find a lot of info and it looks like you are on the right track