A comment on the elbow pain... I've just ran into that problem after increasing the amount of sailing. Only one elbow, strangely (left).
After poking around online, I've stopped holding the sheet with my elbow bent (as much as I can) - it has made a significant difference. I only bend my elbow to bring in the sheet, and try to let the sheet slip to let it out.
I'm hoping this approach avoids needing the upgrade. So far it has made a huge impact.