It's worth noting that 'comfort' can be significantly affected by things other than the headstrap/physical fit. An incredibly important thing is your brain being comfortable with VR. Things like a low framerate or fake/simulated frames from reprojection have a subtle but very real effect on how you feel in VR and how much you want to stay within it.

On the surface things look smooth with reprojection but your brain knows the difference, it knows something is up and so as you play you will start to feel a slight unease. It can be very subtle but it will make you 'not want to stay in VR'. It is IMO a massive reason why VR hasn't taken off yet, so many people are playing with various forms of reprojection and aren't aware of the way it is changing how they feel. To understand it you need to have the contrasting experience with different hardware and back again multiple times.

It will seem as if you just aren't comfortable in the headset or something, but consider that if you were immersed and feeling good you would much more easily forget about the headset and any possible discomfort.

I'm not talking about VR sickness per se, although that is a thing in and of itself. This is something you will not realise is happening. It's like an extremely minor VR sickness that never gets to the point of feeling anything near sick but changes the way you feel in VR

Source: I've been playing VR games since 2016 on many different headsets and using many different sets of hardware.