Easy hitTestPoint question?

I need to create a loop to test a set of circles (c1, c2, etc.) to see if a set of flags (f1, f2, etc.) are "on" them. I have a movieClip at the bottom of the flag pole (hitSpot_mc) so I can use that as the test point.

It works fine if I use hitTestObject, but I want to test on the actual circle, not the bounding box, so I tried this but it returns false, even though 2 of the flags are clearly on 2 of the circles. I thought it might be a case of localToGlobal (even though this is all in one movie), but that didn't seem to make a difference:

Code:

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for (var k:Number=1; k<=3; k++)
{
        for (var j:Number=1; j<=3; j++)
        {
                var globalPos:Point = new Point(this["f"+k].hitSpot_mc.x,this["f"+k].hitSpot_mc.y);
                globalPos = this.localToGlobal(globalPos);
                trace("hit? "+this["c"+j].hitTestPoint (globalPos.x, globalPos.y, true))
        //this line works correctly

                trace("over? "+this["f"+k].hitTestObject(this["c"+j]));
        }
}

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