18 years ago before I started building and shooting selfbows.I shot a lot of differnt recurves.Most true recurves brace between 7,8 inchs yours I say around 8"to start for you.Then you can either start up or down.By twisting it 2 times and shooting it.To you can find the sweet spot in your bow.After you get close when it's starting felling better.Switch down to one turn.Even prouction bows in different hands can be little different.
No one can tell you the exact number it will only get you close.You have to shoot it and no one can do it for you.Again they can only it you close SHOOT,SHOOT and SHOOT some more.Plus shooting can't hurt your over all shooting.
ROY