I face this a lot, and the answer is the load option and passing. The goal is to get user defenders out of the front to then get back to your bread and butter. It's a constraint defense that calls for a constraint play by the offense.
With load, you want to run it against the 1 tech and isolate the end man on the LOS. I've had a ton of success with it and call it more than triple and midline combined. You have the added advantage of being able to run it to either side with full rocket motion or orbit motion where the A back runs back to his original location.
The only disadvantage is there's no load option in the 21 personnel formation in the game. In real life, that's PJ's first response to bear fronts.
The trick is when you're in the formation, you have a lot of options. The Z is actually lined up on the same side as the A back, giving you an unbalanced line but a 2x2 passing set.
I use this formation combined with trips (see below) to make bear fronts cry for mercy. You'll get a lot of 2-3 yard gains, but you will eventually pop a big one. Use hot routes to create plays like now screens, stick, and some other two-man pass concepts. That will get the defense out of the bear front or at least give you a two-high look to run against.
Trips has a sweet load option that double option that doesn't use the automation. You can flip it to either side and really chop wood. Once they widen out, you run midline and the standard plays until they squeeze again. Repeat.