I was having the same problem. I'd give up at least two big runs on the black set.
Check the ratings of your front seven. Do they have a high blockshed and tackle? And do you stack the box (I use 46) on potential running downs?
That's good your usering to stop outside runs. Most of the big runs from CPU happen because of me. Not playing with any assist, it's easy to over shoot a play or miss hit sticks lol.
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