I know loads are a problem but loadless already seems to be in place. Is there any movement tech/skips you perform on PC not present on the console variants, or have these versions not been fully flushed out and tested?

It would definitely be something interesting to test out. I own the PS4 port and I can say super jumping is completely possible but a bit awkward because of controller layout. The major downside to the console versions is that you are without the quicksave / quickload which severely limits using major strats (Dead Man Walking namely but also manipulations like the start of Part 1, Chapter 7.)

ok, so the console version is unoptimal in a manipulation sense. how much time would that lose?

The console version is not optimal in the sense that major strats cannot be performed. Overall, I do not know how much slower it actually is because I have never attempted a run on console.