You should spend some time after your 5RM´s and try to extend them whereby going for new PR´s. Then if you´ve still got anything left, you try and do negatives for some exercises, the others you can just continue with your(hopefully) new 5RM´s until you SD. Then once you´ve got them you use a calculator to work out your new RM´s for each given rep-range. I generally dont do that as I do long(9-10weeks) cycles so Im usually done and dusted by then. Ill just increase as I feel appropriate. Its not as accurate as going for new 5RM´s though.