Ang: Nice looking plant and smart to pot up the two stems that broke off!
Sheryl: I think it varies. I've heard that most hoyas prefer to be root bound but I'm not sure about kentiana. I have H. wayettii:
Wax Plant (Hoya wayetii) which is similar to kentiana and it's really potbound but it seems to bloom all the time so I guess it's happy. Sometimes it takes a long while for roots to fill a large container so I usually underpot my hoyas.