Cs4 -As2 - Motion trail out of synch

Hi All,
I have created a bouncing logo (similar to a screensaver). The MC loops and I have added some motion trail using dupe mc's, however when the main MC loops back to the start, the motion trail seems to go out of synch and fall behind in its positioning. I have attached the FLA to show you what I mean and you can see the AS that I have used.

Can someone help me get the motion trail to snch with the looping please?

Thanks

Code:

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onClipEvent (load) {
        numCopies = 5;//Number of copies to make, adjust as you wish
        this.swapDepths(1100);//Make sure the original MC is at the 'top of the pile'
        if (_name == "pie") {//Only run this code from the original MC, not the dupes
                for (i=1; i<numCopies+1; i++) {
                        duplicateMovieClip("_root.pie", "dmc"+i, i+1000);
                        _root["dmc"+i].nm = i;//Holds the # of the MC
                        _root["dmc"+i].af = 100/numCopies;//Used to calculate the amount to fade each MC
                        _root["dmc"+i].fr = 1-i;//Used to calculate which frame to go to
                        _root["dmc"+i].onEnterFrame = function() {
                                with (this) {
                                        fr++;//Which frame?
                                        if (fr>_totalframes) {
                                                fr = 2;
                                        }
                                        //Loop it
                                        gotoAndStop(fr);
                                        _alpha = 80-(af*nm);//Set alpha
                                }
                        };
                }
        }
}

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Hey thanks dawsonk, works a treat...sorry for being a newbie :)