FYI If you use
showAllDataTips="true"this will create a mess is not what you’re probably looking for. So few things to note. First in your series, you need to use an itemRenderer. They come will the charting so they should be available for you.
mySeries.setStyle("itemRenderer", new ClassFactory(CircleItemRenderer));
Now if you are specifying your own colors, you need to not only set your strokes and colors but in order to have your colors of your CircleItemRenderers match your strokes, you need to make sure and set the Fill to that same color.
mySeries.setStyle( "fill", myColor);
The last thing to note here is on your chart to set
clipContent="false"so that your datapoints or CircleItemRenderers don’t get cut off on the edges.
Hope this helps!