Attaching Sheet to Jib
If the ability to easily change these sheets over between sails is part of the issue, I''d suggest that you not use a bowline knot. After subject to high load, the bowline can be hard to break open again.
In an application like this, I sometimes use an "angler''s loop". At least, that''s what I''m told it''s called. It''s basically a bowline, but (for those of use who learned the bowline at an early age...) the rabbit goes around the tree a second time before ducking back into the hole. This extra turn prevents the knot from jamming up on itself so tightly.