cobra grille insert install questions on lx

i put in my cervinis cobra grill insert(with out tape yet as it needs paint)and had two questions

1.am i supposed to cut out the fiberglass header panel (behind insert on car once its installed)?you can see it way back there if you look through the grill.is that normal?

2.the center of the bumper cover on the lower edge of the insert is about 1/8th of a inch away from insert.it takes alot of pressure to hold it to the insert.will the tape hold this?