Hi Titan
Your dummy booking for Tiger will only show those pax who have chosen to pay extra to reserve seats. Most punters on the short flights won't pay the $$ to choose their seat.
I've done MEL-CBR a number of times and the number of reserved seats is often under 10, even if there is 120-150 pax on the flight.
Anecdotally then, 20% of seats allocated on ADL-HBA, will probably equate to a pretty full aircraft!
Would be interested in hearing from someone who actually knows something as to what the TT loads are looking like, though, esp on the new ADL flights.