Thanks for the comments, I’ve had a look at the sails that I’ve not been using, i.e. my spares, and now feel a bit stupid.
The cloth is stiffer and less creased. The mainsail has a line of reefing eyes fitted, saving me the bother! I’ve also noticed though that the “spare soon to become preferred” mainsail is smaller than the standard size, the foot is about 200mm less. Any ideas why that might be?