I would take it again with the caveat that it won't count as your colddiagnostic since you have seen it before. Take it timed under strict conditions with a thorough clean copy BR. Definitely not a waste!
PT 55, 53, and 52 have been the most brutal for me. 55 was my colddiagnostic, 53 and 52 have been taken in the last 24 hours. Mid-late 2000's were difficult