Nothing weak about Balangan. You asked for a mellow crowd suggestion and that's what you got. Balangan is the fastest wave I've ever surfed (I've got plenty of time to correct that). Ulus is clearly a way more quality break but you'll have to do your share of hassling.
Is this a place where you could walk to the breaks? Where is Ulus? Both waves do seem legit according to google.
Or hire a motor bike to explore? Seems like a nice place for the lady and its really close to the airport. Thanks for the rec/advice kind sir.