My advice would be find custom sliders that work for you. Go through the pre-made sliders page and find a set at the difficulty you like to play at and give them a try. Anything you felt that was too easy or too hard, simply tone those sliders up or down until you get to a point you're satisfied with.
https://forums.operationsports.com/f...tball-sliders/
Another thing that is more user dependent would implementing a kind of 'house rules'. Especially for Madden because there are a lot of formations and sets that if you hot route/make pre-snap adjustments correctly, you can torch the CPU defense at any level. There are simply some plays that work a lot better than others. I don't know if this ties into your issue, but trying to utilize the entire playbook and not relying on 'money plays' is an easy way to make games more difficult.