At least half my tracks don't sync from itunes

Sorry, "haven't yet cued" -- where and how? Not sure what you mean.

Havent yet cued as in they don't have any memory or cue points, and probably have not yet been analyzed by rekordbox.

So when you bridge the tracks into RB, it will not see them or if it does it won't analyze, correct?  What system and versions of ITunes/RB are you using.

Itunes 10.somthing, and rekordbox 3.0, Windows 8. I can see the tracks in rekord box when I am browsing the bridge, but when I copy the playlist folder over they are gone.

Are you using the sync manager or manually drag-and-dropping the tracks from the iTunes playlists to rekordbox's playlists?

Tried both methods, same outcome

It seems as though new tracks cant be added to the collection

So I was able to work around the problem by making a smart playlist in itunes that contained all of the tracks from the folder I was importing.

Then I went into that playlist in rekordbox using the bridge and instead of dragging the whole list to playlist, I selected the tracks and drug them to collection. This imported the tracks which had not yet been imported and now when I drag the playlist folder all the tracks are there.

Is there a better way to do this?

To reiterate, when I drag a playlist from within rekordbox from the itunes section to the playlist section of redkordbox, the tracks which are not yet in my collection do not import.