What is the serial number off the back of your mower?
I'm asking, because Honda issued a Service Bulletin way back in 1999 about "difficult to roll backwards" problems with this model. The problem is binding on the adjuster plate, and a new type plate was introduced starting with serial number -6186178. If your mower is older than this serial number, it may benefit from new adjusters.
Let me know, and I can post the full bulletin...