your dissatisfaction isnt with ALPA, its with the local reps you guys keep voting in, the MEC those members select and the members of the NC and other committees. Going to IBT wont change any of this, you'll still have the local leadership doing everything they do now, you just wont have national resources to help them and/or you.
If you want better QoL, pay, scope, etc, IBT isnt the answer. The answer is recalling your reps, voting in people that want the same things you do and voting NO when the crappy TA comes from the NC. If you have a crappy contract its because, in part, of the reps who were elected/volunteered into various positions and ultimately with the pilots who ratified the contract, NOT because of the national association you happen to fall under.