In the video you said you weren't sure what you were doing, I would make one suggestion if you wanted more color on the meat. Put it on and don't touch it for a while, if shredded like you used. Think of it like a smash burger untouched and you let it ride for a couple of minutes to get that char and crunchy side.
Thanks for the tip...I'll do it like that next time. We really like these sandwiches.