You are allowed to use the Kidani pool while staying at Jambo, there is a quick shuttle that brings guests back and forth, so I'm not sure what switching your stay to Kidani will do for you. I'm thinking that the pool area will definitely be more crowded, though. The Jambo pool always is...
If you'd like the ease of being near your friends, I wouldn't change to another resort, personally.
If you'd like the ease of being near your friends, I wouldn't change to another resort, personally.