"Play Offense Only" overpowers your schools defense

Whenever I play offense only, my teams defense holds whatever team to almost zero yards. It's completely unrealistic for my 76 OVR Purdue team to dominate stronger teams like Michigan or Tennessee, but we are doing it. I don't know what it is about the sim engine this year, but it definitely needs tuning. I am experiencing this on Heisman mode with default sliders.