fwiw - since about February? been experimenting w/ a GoPro 8 primarily for it's image stabilization & I've been very happy with it. changing batteries during a ride is a nuisance that I'm working around, but so far, I haven't gone the power pack route. honestly don't know if it has a looping/overwrite feature. I just take clips of highlights & road crossings or intersections
good luck w/ your quest!