I know a owner of a zoo in toronto and his dinking with african rock pythons. he had a very easy going Arock (odd huh?) and actually went to a importer and viewed quite a number of arocks until he found one less willing to strike. he has been breeding the most docile to most docile and actually has a a large group of very calm trustworthy African Rock pythons.I have seen a handful of them now and they are all big teddy bears very burm like really chill and relaxed. Many animals temperament is at least partially genetic. It is a best guess that temperament is partially genetic in Royal pythons too. It is quite likely not so much breeder size based but also the parental temperament as well. I have friends whom are not breeding poor feeders and to see if they can produce a line of Royals that are all good feeders. They are in 4th gen so it is to early to say but it is looking like there maybe something there.