I would agree about the GP sail, it very much a sail that you overpower the sheet or let it off a nano and it is now too loose, going to the 10:1 simply means you are pulling more sheet for less movement thus getting better control.

Does anyone have an idea on how to splice D12 onto a conventional sheet, I want to change to an 8:1 ( I would need to change all my blocks to get too 10:1 ) but it will mean my sheet is too short, easiest would be to splice in a smaller sheet for the section that does'nt emerge through the ratchet block ?