hi
if you look at a lot of the older pros with strange swings thay all went with what thay had and made it better, the younger tour player tend all to look the same and use the same swing, it your playing off 13 then you must have a good all round game, maybe use what you have and try and tweek it here and there, if you change to a higher plane you could end up rebuilding you whole swing. depends on how happy you are with your swing, 60s and 70 it was a flat swing that was popular and in the 80s a high swing like faldo's, now it seems to being going back to the flat one plane. how tall are you as someone like me at 5"8 tends to be flatter than a 6"2 guy.
bill