Hello Ppl

Just a quickly You might have dealt with this before
In Premiere Pro 1.5 i have being doing some moving blurs using the track matte key ,And the problem i keep having is i move all my key frames into the right position for the vid .Then once i have done this some are spot on and some are way out
Now i have gone into the maximum view so i can get precise key frames but still have this problem?

The Two things that i think that might be giving me grief are the
-Scale Settings
-I sometimes feel i moved a line when im meant to be moving the blur(When you grab the screen shot to move it)

Any help would be much appreciation

Ps Sorry if it's hard to understand I find it hard to explain things sometimes