so I've been doing some tutorial training speedruns and noticed that no matter how fast I do it, it's always up to my aim during the parts where I have to shoot bots

Ok...

Yep the better your aim, the faster your run can be (after already having an understanding of all the other small time saves). If you ignore proper positioning/timing, your run will be slow, even with GM-level aim.

yeah, once you learn the simple things like door jumps and dialogue skip on abilities.. its really just aim and timing reload and rockets!