I'd reset back all the way to 405, and do 5 sets of 2 on my DL day, adding 5 lbs each week. You've doubled your volume, and given yourself time to break through the sticking point. Peaks and valleys my friend. You dont have to constantly work around PR to achieve them. I'd Rack pull 3 days after DL day, but only if you feel up to it. Good luck.