Learn the bottom deal in the order Jason England mentioned (Erdnase grip, first modificated Erdnase grip, Geene Maze Grip, Mechanics Grip).
He also says in the last section (bottom deal from mechanic`s grip, I assume you`re not referring to the push-out method in erdnase grip, but the loosening action in mechanics grip ?) that he has very large hands and doesn`t bottom deal without the loosening action because of that. If you can do it without the initial loosening action, do it (his own words in the video).
He also mentioned that he uses the erdnase pushout-method from time to time with very sticky decks.
You should carefully watch the video again, it`s all in there. Pay close attention to his advise