While UCR is more commuter than most UCs, it does not appear from the housing stats that it is predominantly commuter.
Whether some of the residential students are “suitcase” students is a different matter and not tracked in campus stats
I agree. UCR has what you want and need. You really should be looking at the other schools and asking: “Can you beat this?” If one of them can, then consider it, otherwise, I think the straightest path into med school for you is pretty clear.
Pomona probably can. It’s the best choice in terms of resources, support, etc. + Keck/the Claremonts.
OP is an upperclassman in terms of units, but post #5 on this thread includes the phrase “…once I turn 18.”
OP will probably fit in just fine with other freshmen, esp. honors students, due to age.