I just spaced them evenly, however it lifted with the boot clips so I removed it and added butyl tape, clipped back into position and lightly clamped tight. nice n stiff n tight now.

My boot did that too, its like they could have allowed another 1/4 to 1/2" of material. Looks like hell pulling up when snapped on, so I am going to take it down to an upholsterer to use as a template and make one the correct size, and with better backing. Should not cost too much..and it is the only major trim bugaboo I have