How big are your gaps. Bear in mind that on my march, they're about 6-7mm (from memory) at 40yds... on a leup comp, that could be 3 feet
I know one handy leup comp shooter who says his gaps are so big he's not even sure if the thing shifts or not, because even if it shifted by something like 5mm, his gaps are so big he wouldn't be more than a yd or so out.
With the march being so snappy and precise, i went for a thin pointer... if i'd gone with something thicker, i could have added to the problem... perhaps it's just a thickness of a line out with a thick pointer?
If it works though, i wouldn't worry about it...