Well IMO, you need to consider as to why you want to apply to Columbia now?
Personally, if I have 4 interviews lined up already, I wouldn't bother applying cuz it'll just be a waste of money. However, if you are serious about getting in to Columbia, then yeah, try it out... as long as you have the extra cash to spare.
But you have to be realistic too. How "average" are your scores? On predents, the average TS score for Columbia was 22... so I would think twice applying and spending money if my TS score is lower than a 20.