I'm buying a particular used mainsail I found on a web site no matter what, however I'm wondering what a sail cognoscenti or sailors in general think of the change in dimensions and the effect it would have on my boat. The following are dimensions of my current mainsail and the dimensions of the sail I'm buying: Current - I - 30', J - 10' 6", P - 24' 10" E - 8' and the sail I'm buying, I - 30', J - 10', P - 26' 5", E - 10'. Any thoughts appreciated, thank you.John