I do like alternating rep ranges on the DL day. Try this though for now. Try to pull a single every week for about the next 8-10 weeks or so. Next week, pull 380x1. Then just add 5 lbs per week for as long as possible. That should take you up to around 425 or so if you make it all the way. Then go back and try and pull 375x5. Then start your alternating scheme of 5/3/1. Will wind up around 375x5, 400x3, 425-430x1.