I have the same exact problems. And if you notice in key controls (PC) "Defense Engaged", Speed rush and switch player are both assigned mid-mouse button or F key.
That's not gonna work very well for anyone.
And that's also what they call "screwing up a glass of water".
Playing from the D-Line is almost totally broken. It's 90% luck depending on whether the other linemen (AI) do their part or an O-Lineman fails.
Can't really play that way if that's what someone likes doing.
It's preferrable that they fix the longstanding bugs, contrasting rules/structure (compared to real NFL) and incomplete rosters, than make changes that compound problems that make it difficult to enjoy the game this go-around.
New changes aren't cutting it. As I said, improving the previous existing game would've been the smart move.
They should've saved face by delaying the release to fix these, instead of stringing us along, waiting for needed fixes that shouldn't have made it out of development/QA in the first place.