I spent a few hours last night trying to get the bucket curl figured out using the single 10" stroke cylinder. And I don't think it's going to work.
I wanted the single cylinder for less weight, less hoses, less money and tidier appearance. But even the 10" stroke is a tight fit and any thing shorter, I think the fulcrum will be too short, needing too high a pressure to operate.
I'll fiddle a bit this morning, but I think it's off to the store to trade one cylinder for two longer ones. Probably a good reason 99.5% of loaders use two bucket curl cylinders.