From a quick little skim of the reading, sounds like your bears are not particularly fearful and/or have gotten used to encountering humans?
I went looking for land speed of black bears and wound up finding a cute website article written from a Grizzly Bear’s perspective titled “ASK A BEAR”. WHen asked how fast bears run, the grizzly bear answers:
“Sigh. It seems like there’s always some human who wants to figure out a secret way to best me on foot. Can’t you just be happy that you’re (sometimes) smarter than me and have access to modern plumbing? It’ll have to do, because there’s pretty much no chance you’ll ever be faster than me.
It’s well-known that I can reach speeds of up to 35 mph; some scientists think I can even go faster than that. What’s less known is that I also have incredible endurance: On multiple occasions, scientists in Yellowstone have clocked grizzlies running 25-28 mph over a distance of two miles, and according to observers, I wasn’t even breaking a sweat.” MORE AT LINK
https://www.backpacker.com/stories/ask-a-bear-how-fast-can-you-run
I later found an article saying black bear speed is 30mph.
Young adult males are the ones I'm worried about. Up to about 300lb and probably not even that big. I've seen them moving fast.
These big monsters? They plod along at a walking pace. The most I ever saw one do was a 10 step hop. I was trying to run him off and fired off the air horn. He just sorta sped up for a couple steps, then back to the lazy waddle.
They are definitely acclimated to humans around here. The young ones are very skittish and it takes nothing to get them to run off. The big ones don't care about much of anything.