I have no new info on bloods/short-tails other than what we both could find online, so can't add anything new there. :s
Like I said, it does depends on the individual snake, and you seem to have gotten the good half with your bulls and carpets.But if a first-time owner is asking for a 99% "for sure" docile beginner's snake, famously handle-friendly, corns or balls would always be the way to go- can't deny that.