I did roughly 20 miles, mostly throttle only, on my RadRover before needing a "eh I should probably" charge. I had (IIRC) two bars left. I was going to max out the battery but I was camping and it was going to storm following day so I had to run the generator that day for 4 hours to charge the battery back up for the remaining days of my trip.
Needless to say - that was roughly 20 miles of roaming around the camp area (roughly 30 camp sites), back and forth trips to the public restroom (lots of beer), trips to the beach to brush my teeth enjoying the view and most of all - LOTS of sand riding on the beach

Tires set to 20 psi
So I think your battery is pretty close to normal. you're doing 10 miles and only down 1 or two bars on PAS2/3? The bike is putting forth more effort than you it sounds like..
Here's a video of beach riding, in case anyone cares. (Mostly footage of my GF on the beast)