The 5 to 1 blocks with the 2 single blocks on the boom was the standard when I bought my boat in '85. You now have the right arrangement. Just one note, what you call a winch in your diagram is just another pulley with grooves. When the ratchet is turned on, that pulley can only rotate in one direction. To feed line out, the line must slip over the pulley and the grooves slow it down. It helps you hold the sheet when it isn't cleated. If the ratchet is off, the pulley turns freely in either direction. I use that position when I get out on the wire and want to be sure I can release the line quickly.

Howard