Ok so i bought a "hitec hs785 hb" sail winch servo.
Cant believe it but im having exactly the same problem! I thought it might be to do with the code i was sending from processing so tried it with examples/servo/sweep. it just doesn't do what the code says it should. Instead of moving 180 degrees, it moves about 280. I think it is controlled in exactly the same way as the motors i had the original problem with.
Can anyone help?!
cheers
Rich