onRollover and onRollOut problems

Hello
im using Tween Class and when a target Mc gets rolledOver/Out it gets tween larger/back to org size.

but it gets jumpy and the target MC tweens back and worth on 2-3 frames (looks very very very laggy and buggy)
i have 24fps and ive tried regular/elastic/bounce/strong tween settnings.

Any ideas?
=)