Hi Jonathan,
The problem you have is that the Condor has a low aspect rig and quite a flexible mast. If replacing with a sail off another similar sized boat you should be prepared to visit the sailmaker to reduce luff length/area and match the luff curve to the mast. It will probably be less hassle to replace both mast and main from another cat with a more modern and more powerful rig. If you can't find one easily try contacting insurance companies for spares where boats have had hulls trashed.
Great boat the Condor. Brilliant balance and loads of bow buoyancy. They remain fast and forgiving in ridiculous conditions. A genuine single or double-handed cat decades before the F16.

Good luck

Cheshirecatman