[D81SKINS]

All-Pro is really tuned good this year. All I've done to make it more of a challenge is, use coaching suggestions and strategy playcalling, adjusted the penalties to match what we see irl, and lowered the Int slider so it's less probable for defenders to catch every bad throw.

I'm playing every game on the schedule(32 team control) and I'm using the teams that won irl and trying to win w/ them in my CFM. So far I'm 14-5 using the teams that won irl.

I think alot of the slider changes are not needed when you play more of a coach mode style and stick to coaching calls and strategy calls. It plays out like a cpu vs cpu game this way.
If your not a coach mode type player, which by looks of your OP you are not. You may want to either start w/ All-Pro and increase just the CPU sliders(like Playmakers mentioned)or start w/ All-Madden and decrease just the cpu sliders.
Penalties also make a difference in the difficulty imo.
If your just looking to jump into a set of sliders w/ a tough challenge, you have plenty of options in this slider forum.