I assume you have a medial readout on the results, if not ask your doctor for one.
That said a HR of 55 is fine if you don't have any problems with dizziness or other suggestions that your heart can't get up to speed fast enough when you move from a resting to walking positons. Anyone jumping up and running can get a shot of dizziness, but getting up to walk one should not I believe. That said, I don't think there is much a doctor would recommend about keeping your resting HR higher than your normal 55. Don't have the exact number, but something below 40, especially if there are skips/stops would be a candidate for a pacemaker - not something I think you need. I am not a doctor, just sharing in the hope it will help you decide what to do.