Changed to 7/16" dacron/exotic
core braided halyard for ease of handing. Way overkill for strength. Used to have a 3/8"/10mm similar spec. line and it worked fine but got a deal on the larger 7/16"/11mm so went with it. Main is 270 sq. ft.
Even if I wasn't using the exotic line and had StaSet X, VPC or even straight old dacron, would not go larger than 7/16".