Not sure what the issue was because when I got the new fasteners I had no problems getting them in. The fasteners appeared to be the same, a new day, patience and persistence.
Now that I have the firewall insulation I planned to move forward, that didnít last long as I had problems with the fasteners that hold the insulation in. I destroyed half of them with zero success, I tried multiple different methods but just couldnít get them in. Time for a break (and to order new fasteners).