50/50 is unrealistic. NFL teams combine run man coverage only 34.9% of the time. Like I said, your problem is unrealistic play calling. That is why you get unrealistic running of CPU QB. Call plays realistically and you will see more realistic QB running.
https://www.profootballfocus.com/new...eme-tendencies
"The league is overall a zone-heavy league. All 32 teams combined to run zone coverage on 59.0 percent of snaps with just 34.9 percent man coverage (the remaining 6.1 percent falling into a miscellaneous category including prevent, red zone, and goal line defenses which can contain elements of both and don’t sit accurately in a typical coverage shell)."
Even the most man-coverage heavy team in the league failed to hit 50% man coverage in 2016.