This week, I've made more tweaks to the formula. I've changed the Special Teams grade to be a weighted average, added situational downs, and reformatted the offense and defense scores to average the drive grades before averaging that value with the Yards Per Play and Situational Grade. Situational Downs include 3rd down, 4th down, and Red Zone. Next year's sheet will also include Goal-To-Go situations. The Situational Grade is weighed by occurrence as well.
Situational = (3D Grade*3DA+4D Grade*4DA+RZ Grade*RZP)/(3DA+4DA+RZP)
For non-weighted grades, the formula is the same. It's the difference of how better or worse the team is performing than league average, divide that by the league average number, multiply by 100% and then add 50%.