If you have a small hammer type hole punch, or metal tube to make one from (grind a taper like sharpening a popsicle stick 
it will cut like a chisel. Or maybe even a loose leaf paper hole punch, but make a circle at the end of each pie slit. It should relieve some push/pull stresses created by closing the slice(overlapping) allowing a flat lay. (if you can, hide the hole and slit under the track ties, under ground cover, etc., using screws/pins to hold each slit in overlap where you can too).
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