outhauls
Outhauls seem to ne notorius for lack of purchase. The one on my C-310 certainly could use a bit more mechanical advantage. The boat I race on (not a Catalina) has a small winch on the back of the mast that the outhaul can be run to. This works well but requires someone to go to the mast and make the adjustment while someone in the cockpit watches the mainsail clue. Given the cost of a winch it's probably not worth adding one unless you are a serious racer. However, you may be able to run a longer line on the outhaul back to the cockpit and use one of your exsisting winches.