Glimmeryjewels, have you tried on pearl earrings (at Mikimoto or elsewhere locally) in the pearl sizes you are considering? Personally, I would go with 8-8.5 mm or 8.5-9 mm for the earrings. It seems like most people like the earring pearls to be the same size as, or larger than, the pearls in their strand, so if you go with 7.5-8 mm earrings, that would be the largest size strand that would look "right" with the earrings IMHO.
When I was 30, I purchased 3 strands of 7-7.5 mm Akoyas with matching stud earrings. A decade later, those pearls look really small and juvenile on me. 8-8.5 mm is the smallest size that I like on me now, so I wish I had bought larger pearls back then -- either spent more or bought 1 or 2 larger strands instead.
The PP Hanadama pearls are stunning in person.