So this is now a little weirder. League Park's dimensions are below. CF is 420ft away with a 10ft wall; RCF is 400 with a 20ft wall.
https://www.dropbox.com/scl/fi/knrxc...l13ai2f0j&dl=0
Ron Blomberg (power ratings in the 400s) just hit not one, but 2 500 ft+ homeruns in a game there.
So maybe it's not the park dimensions causing this?