I know this isn't much help but sometimes the gaps in this game are just glitchy. The one in Santa Monica over the roof you destroyed took forever to work for me. Only things I can say are to make sure you're doing it the same side the videos are (ie horizontal vs vertical) but try both ways across. And do a boneless for extra air. Sorry I can't be of much help.
~Retail 100%: 128 - Latest: Sunset Overdrive~
~Arcade 100%: 84 - Latest: Magic 2014 DOTP~