I got a few records before posting this one - its still not the run I want, but it's enough of an improvement. I thinking sub 4 is doable, I've gotten to the boss room at 4'09'' with a few major mistakes. If I ever land the first diamond clip I try for it will make this a lot easier, but this has only happened once in a good run before. There are a few other tricks I almost never get that I plan on implementing eventually, and after I feel I've optimized this run I'm going for full game inbound mod.