I'm going to assume that when you say 450lbx2x5 you mean "Two sets of five at 450lb." Correct me if that assumption is wrong. The way your opening paragraph is written makes the "current weights" section confusing.
Your plan of switching to 2.5lb jumps for the bench is a good idea. I've experimented with continuing 5lb jumps and switching to intermediate programming and I like it better just to stay on LP with 2.5lb jumps for my lifters. You'll need to do the same for your press at some point.
For the squat, I would have you do 1x5 top set and 2x5 back off sets and then transition into intermediate in two to four weeks.