My LBS had both a Turbo Levo SL Comp and Turbo Levo Comp in stock when I made my purchase. I test rode both. Both are sweet bikes. I went with the Levo Comp which was approximately 10 lbs. heavier (49 lbs. total). The Levo Comp offered the 2.1 Brose S motor versus the 1.1 Brose S (SL model) and...
When I got my Rad Rover a couple years ago there was an adjustment that could be made on the current screen to increase the speed. It work for me. You might want to do a search on the forum to retrieve that information.
I have two mid drives (road and mountain bike) and a hub drive (fat tire). If I were going to do the fat bike again, I would have gotten it fitted with a mid drive. Mid drives are better for trail and torque.