Sled Pulls on off days following squats and deads.
This is the problem with recovery in my opinion. If I do any type of cardio on my off days it wrecks everything. It don't matter how much food/sleep I get if I don't rest (other than walking around all day at work) on my off days. Sled pulls are high intensity so that may be the issue.
I was doing sled pulls on my off days (following lower body workouts) before and making good progress. Adding them to the end of my regular workouts proved disasterous for me.