Here is how I always train, whether on cycle or not. I go based on reps 6-10 1 warmup then 4 working. As long as I am failing in my rep range I am happy. Setting weight values to lift is ridiculous, for the simple fact that you have good days and bad days. Sure I can bench 315x2 on a good day but will that mean I can do it well everyday, in a word no, in a statement hell no.
If it is difficult it is good, at least thats the way I look at it. If the warm up is more difficult then normal I wont go up quite so high. Of course I do reverse pyramids as of late so it might be different for other programs but difficulty is more important then weight in my eyes.