Not exactly what I meant. When I said combine X and A with LT I meant
one of them, not both. It's situational what's best.
What I do is that I use LT (RB as well if the opponent is running, since this allows me to move faster while using LT) the moment he makes a bad move or I think I got a chance of getting the ball I release LT (RB as well if you are using that) and press either X or A.
Another good tactic is not to rush the opponent, but rather wait him out. Each time the opponent gets past one of your players there are fewer of your players between the ball and your goal.
Instead, try to "lure" the opponent a bit deeper into your part of the pitch, then you should outnumber his players and make it easier to get the ball.