capturing planets question

[dbt1949]

When I first started capturing planets I just had this one big transport,but to my surprised it droped all 400 troops on the one planet.
Now I like to have 6-8 troop transports(I find the battle cruiser hulls to be very good for this,very fast,reasonable shields,can carry enough troops and the planets defenses usually go against a more heavily armed ship).
As soon as I conquer a planet I leave the troops and the troop transport behind as I go to the next planet.