Yup, sorry, I made two separate mistakes there (misparameterizing the beta distribution by alpha+beta,beta rather than alpha,beta, and the off-by-one error) -- but at least my wrong parameters were less wrong than yours :-).
Yup, sorry, I made two separate mistakes there (misparameterizing the beta distribution by alpha+beta,beta rather than alpha,beta, and the off-by-one error) -- but at least my wrong parameters were less wrong than yours :-).