Arcing projectiles

i’m having trouble with using the suggest projectile velocity,the projectile velocity doesn’t work right for some reason having the projectile either shoot kilometers into the sky or fall before hitting it’s mark,
the start vector is just using the character position with an added offset the end vector is where my mouse hits,the velocity is the equal to the length of the path so it’s flight time always being a constant,but for some reason this function doesn’t work like it should

Is gravity enabled for the projectile?

yes it’s 2 i even overide it(in the suggest projectile velocity)

so you are looking for automatic correction for projectile trajectory?
You can always try manually setting the velocity from using math formulas: http://en.wikipedia.org/wiki/Trajectory_of_a_projectile

otherwise you can disable the gravity and set z-offset manually using timeline(?) to make it look like a curve