Once Again 'The BJD Orbyrarium' was a great sorce of information!
Stringing Tension: What is too loose or too tight? (Some Helpful things from Den of Angels)
some dolls actually react differently to loose or tight stringing, but in general... loosely strung dolls have limbs that feel wobbly -
you can pose an arm, but it will slowly slide out of position because of gravity. The doll may not sit or stand well, or at all. There
can be a sense of floppiness at the waist. A doll that is strung too tightly will get "crazy legs" - legs that snap into a 45 degree
angle, or suddenly kick out straight. This might also make standing difficult, because the legs can basically only hold two
positions, straight and fully bent.
some dolls actually react differently to loose or tight stringing, but in general... loosely strung dolls have limbs that feel wobbly -
you can pose an arm, but it will slowly slide out of position because of gravity. The doll may not sit or stand well, or at all. There
can be a sense of floppiness at the waist. A doll that is strung too tightly will get "crazy legs" - legs that snap into a 45 degree
angle, or suddenly kick out straight. This might also make standing difficult, because the legs can basically only hold two
positions, straight and fully bent.