If he's going to a 4-4 and blitzing then you should have mismatches all over the board when you're 5 wide.
Some things you can do.
- Add an audible for a jailbreak screen to one of your WR's or just keep calling that play.
- If he's jamming all your receivers, put one of them in motion (preferrably your best matchup [WR on LB].
- Utilize a TE or a slot receiver just off the OT. Hit the receiver with a quick pop pass.
The best thing to do when someone blitzes is to replace the blitzer with a receiver. If he's bringing the OLB every play, then throw to that spot.