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.
~Thanks to jtr1gg3r for the sig~
~Retail 100%: 124 - Latest: Defiance ~
~Arcade 100%: 75 - Latest: Ms. Splosion Man~