Need just average defense

In a dynasty league with a few buddies and at this point just have to sim my defense and hope for the best. My offense is explosive but I have no confidence on defense and hate getting gashed. I have talent on D (85 overall in year 2 at a 2 star prestige school) and have tried the double mug mid blitz life and it ain’t pretty. Looking to start from scratch and hopefully only give up 20ish a game while still being able to actually play D. Anyone have any tips or can point me in the right direction?

Edit to add: mainly looking for help vs. CPU. Only end up in 1-2 head to head games a year and can live with those being shootouts