I might have something interesting for you. You could remember me from some discussions here ...about cf shafts for example.
Cue-building came out my hobby recently. So as I'm used to learn by doing I started with the cues for myself experimenting. Being tall my needs and preferences when it comes to cues are far from standart. At the moment I have 4 cues built for myself. All are 62" (31"+31"). So all the butts are 31" long.
All of them are pretty special for certain reasons for me.
If not the circumstances and the situation in my country I would never thought about letting go any of them...but after russian invasion there are more important things at the moment.
So one of the butts could be interesting for you. It is the lightest out of them. Slightly above 14 oz. It was an interesting project. The main goal was to get it light weighted and forward balanced. It was a success first of all due to the construction used. The woods and the materials are exceptional.
The balance of the butt itself is 14,17" (14,05 oz) together with my 3,95 oz shaft it makes the balance 20.5" (18 oz).
So as the pin is light G10. The weight and balance can be easily modified. If I change the pin to the brass one I can get it at around 15,3 oz and pretty forward balanced.
The weight is natural so as all of my cues. It's built to except the rear extension with 3/8-10 modified pin. The extension could be built for it. Due to my height I just didn't need it much.
By making and using the short light weighted rear extension the length could be added if you like and it won't change the balance much.
Now I'll let some pictures talk and if you'll be interested then I can show some more pictures of the process to see the construction idea and other details in PM.
I know you love pool and playing strong so I know this special for me butt could find very skillful hands. I hope your back feels better and you're enjoying the game.
Happy easter!