When you import from the addon, it activates whatever spec you had active in-game. The active spec shown at the top of the screen with the row of icons near your character name is the spec used for all features on the web page.
I guess that I don’t quite understand where you would be manually entering your spec for BiS… the top of the page is the only place to change spec for the BiS feature, and if that already shows Combat/Outlaw… you should be good to go.
Perhaps you could post a snapshot and describe in a little more detail the sequence of events that you are doing? Instructions on creating a snapshot here: