Sometimes it behooves a Jedi to use speech in tandem with persuasive Force powers. With lesser minded Gamorreans it’s probably even less called for.
Speaking of seeing things differently, I’d wager that the Gamorreans, as Jabba’s chosen guards, are probably quite clever, alert and very good at what they do. It wouldn’t work to have a bunch of idiots guarding the palace of one of the biggest mob bosses in the galaxy.