Gotta play those chips, if anything play the hands you would any other time, play the table and feel them out to see who and where you can push and where you need to fold the better cards and let them go cut throat on each other.
Coasting didn't hurt you, didnt help you though. Playing those hands could have got you anouther 10k or so which might have been feel out chips at the final table, the only way playing would have hurt you is if you were overly aggresive in those plays and went on tilt, you had plenty of chips to be secure at the final table, play your hands as you would play them any other time at that stance (IMO)