I have about the same....the thumps are sometimes disconcerting, but have had no injuries and I do have a ramp for those who would rather not jump down.How has the height of three feet worked? I recently moved the roosts up with poop boards underneath with a height of about 30" from the floor to the edge of the poop board. When they jump down there is a thump louder than I'm used to hearing and want to be sure that height is ok.