Here might be your problem. Your instructions are random. You are attacking to out shoot your opponent, I get that but you are closing down the whole pitch, that's what he wants. So he can long ball it to his 3 strikers when you're most vulnerable. Short passing would of been ideal, and then maybe changing to mixed if you find he's getting more chances. Your formation is suited to short, changing to long ball to hoof it up to 1 striker on his own is a waste unless you're countering, but you're not.
Here's the kicker... against 3 wide defenders, formations based around attacking the middle of the pitch are quite effective. For example, 4-1-2-1-2 narrow or 4-4-1-1 etc etc. These are just from what I've learned.
Also, against tough opposition, hard tackling is a must. You don't want them to have the ball. You just have to take the risk.