I have a 25" draw and have shot a lot of Hill and other longbows, from 60" to 70". I found that 64" and 66" are the best compromise for smoothness and forgiveness in a true longbow. For a pure hunting bow, I go down to 62".
While I'm far from expert, I build my own bows now, something between a real Hill style and a flatbow, i.e. just a bit wider limb than most Hills. I've found that in general, I still like 66" best of all, but on my own, I use an extended riser to move the main power action up the limb a bit. I think this gives a shorter working limb and a hair more speed without going to a shorter, less smooth and less forgiving bow.
If you like shooting longbows, I definitely would not go real short. You'd be moving out of the feel of shooting a real longbow.
I'm also a fierce advocate of dropping weight and shooting better while enjoying it more. Give it some thought. Your bow shouldn't be working you like a dog. While I don't make a practice of it, I've experimented all the way down to shooting 3D with a 17# longbow. You'd be amazed at what you can do when you're not fighting the bow. Just today I took a new one out of the oven that I hope will be a terrific 20 to 22# 3D and stumping bow. We'll see.
I hunt with a shorter 64" 42#. Younger guys would want a bit more, but don't get carried away. A real longbow is a wonderful instrument when it and you are really comfortable together.