It is funny about the published vs actual measured dimensions of boats. I think that your numbers sound like real measurements to me. The reason that I say this is if you go to the Long Island Sound PHRF database, the Peterson 34 is shown as having the following dimensions:
Presumably this is based on actual measurements taken from the period when the Peterson 34 was raced as a one design fleet on LIS. I think that the numbers that you posted are subtly different but also probably also reflect actual measurements. The reason that I say that is that your measurements show a slighly heavier displacement and a comensorately longer waterline and draft which would be expected.
That really is an extremely high ballast ratio for that era. I look forward to hearing from you.