set position to object(lags and jitters)

I have been trying to get this code to work smoothly for a while now.

I have a flykick animation for my character with a collision detection box.

I am using set position(hitbox) to object(character) = to image point 1. The problem is that with this code, the hitbox jitters all the time and cannot catch up to my character while he is falling, it just lags behind.

Below i have an extremely and professionally drawn master piece of art to illustrate the problem.

flykick by thegamer123, on Flickr

What can i use to fix this? I tried looking at the *dt tutorial but i was not able to make it work with this.

This is very important to know. Any help would be appreciated. thank you

Post a capx, it doesn't lag behind in my tests.