How do you run QB Blast and Power? I get blown up.... I've tried not pressing anything until after 2 steps or so by CPU but soon as I take control defenders fet off blocks and make the tackle
You run them very, very carefully. In the case of Blast, be patient and don't sprint until a hole opens up. You'll never know which hole will open and where, so it helps to be patient. If you're running Blast out of a formation with a HB in the backfield (Ace, Trips Wk), you're likely going to cut off the back's block but who the back blocks will vary so just be patient and be ready to go any direction. I prefer Blast out of Empty sets so I don't have to worry about my back going crazy.
This trick to QB Power is running to the side you have numbers. The best thing about QB Power is it can be flipped at the line of scrimmage and run either direction. Divide the field in half and run it to the side you have numbers. Don't forget you can motion TEs in and out of the formation to gain a numbers advantage. In terms of actually running the play, treat it just like outside zone/stretch. You want to bounce that run until you have to cut up and when you do have to cut, make it one cut and go. There will be times your back and pulling guard get caught up in traffic and you have to cut it behind them, there will be times they get the edge and you can run outside to pay dirt.
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When you see something like that, you want to run power right. You've got 6 players blocking 5 (I don't count the center because he's blocking back). You're also likely to have to cut that one up because even though it is a tiny DB, the CB will set the edge and force you inside. The other common defense you'll face is this:
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That's your standard 3-3-5 which seems to be common amongst users. 3-3-5 is tough to run outside against in this game because no matter what formation you're in, the CB will stay on that side of the field. In this case you have 7 blockers having to block 7 guys including a tight overhang player and 4 inside the box. You aren't going to be able to run QB Power to the right against that, especially against users who manually control the FS and fly up in run support. The good news is you can flip this play and run QB Power to the left, shifting the H-Back to the other side of the formation and regain your numbers advantage.
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You regain your numbers advantage going that direction, with 7 guys blocking 6. I like to snap the ball the moment the H-Back clears the guard so the defense can't readjust. In that case, treat it like inside zone, you want to burrow straight up field as fast as you can and cut once off the block of your HB (similar to Blast).
I drew these up out of Twin TE Slot since that is the formation I use most for QB Power, but the advice remains the same if you're in Normal or Y Trips or Spread. Divide the field in half, starting with the first player alone over or playside of the center.