Defense has a huge impact on the game. Go to the team defensive stats in your league an sort on various categories. You’ll see very large differences in YPA, passer rating, yards per rushing attempt, etc. These differences between defensive performances between teams depend both on the defensive personnel and how they are deployed.

If King Henry isn’t getting it done for you, it could be your OL, the defenses you have faced so far, or even the down/distances when you do most of your rushing. Star running backs (and QBs for that matter) have widely different performances across leagues. The simulations do have a random component, and we are only two games in. If you believe in what you are doing, stick with it another week or two and see if things get better.