I experiment with a lot of different blitzes and d-line actions in practice mode. The d-line actions involving a pair, three or all four d-linemen stunting like "Twist," "Twist Left/Right" or "Mix" are cool to use to confuse the o-linemen, but I wouldn't call on these too often. Whenever I call on a blitz I usually have d-linemen slanting like "Gap Left/Right" or "Razor Left/Right". But that's just what my preference is, and you may like a different combination after researching combinations on your own. The "Force Fire 0" blitz probably works better with d-linemen crashing in ("All In") though, since the linebackers in that blitz attack the line of scrimmage from outside the tackles. My line of thinking here is having the defensive ends crashing in helps the linebackers to take a shorter route around them to get to the quarterback. Anyway, it's all about making sense of the linebacker and safety blitz routes and finding ways to get d-linemen to move to areas which open up paths for them to get to the QB as quick as possible.
I only control linebackers and I get good pressure when necessary. It's all in the timing of when to burst through the line of scrimmage when heading toward the quarterback. Start sprinting too early and you'll either get blocked by an o-lineman or take a wide path to the QB if you didn't get blocked, which makes you take a second or two longer to get him. And there's no need to go over what happens when you start sprinting too late.
If you're controlling a blitzing linebacker or safety (solid yellow line in play diagram), allow your d-linemen to engage with the o-linemen first. When a hole opens up make sure you approach it at normal speed. Then turn toward the QB, then once you're facing the QB you dart through the hole.
A safety or linebacker that is on a delayed blitz (dotted yellow line) are much of the same except that blitzer is supposed to wait a second before moving.
Kruza