The owners manual for the PSC 34 recommends ½" for the mainsheet and jib sheet. Halyards are recommended 7/16".I am sorting out the last annoyances on a fairly new-to-me PS 34. One of these annoyances is the mainsheet diameter is 9/16th of an inch, which seems and feels too big.
I'm curious to hear from other PS 34 owners what diameter you have for your mainsheet.