Hi Gmac,
I agree with Silver Creek that it would be best not to alter your reels until you try another search or two. If you have a Orvis shop nearby, take your rod over and try the Battenkill reels in whatever size is compatible with your boo. That way you will be able to test for fit and cast with a selection of their reels. I think the regular sports and fly shops that carry the various Cortland series might also accommodate you. I have an older Teton Tioga that seems quite small to me and that might be another alternative to check. Good luck in your search.
Gerri