I know that CM's do what they can to help guests, but if 15 minutes is an issue with an ADR time, and you plan to arrive late to adjust, well, I think you are setting yourself up for a problem. If BOG is already running late, they will not hold your ADR. They may cancel it altogether or place you at the back of a line and your wish will be granted. You will done later. Much later.
I always suggest that folks take a time they can be comfortable with. If your scheduled ADR does not work for you, cancel it and eat someplace else. Deliberately messing around with an ADR to make it more suitable for you places undue stress on CM's who really do everything they can to help a guest, but it also disrupts those people who make and keep their ADR's in good faith.