>>416023147
There's custom straps you can buy for the Quest 2 that fit better. Oculus headsets have this nasty issue where they don't fit all head shapes and the headset will sag as a result. The biggest indicator of this being the cause of your blurry vision is chromatic aberration near the top/bottom of the screen, such as red or blue ghostly outlines or smears around objects.
You need a better strap or a counterweight on the back. The counterweight sucks ass so don't do that.
Someone I knew years ago tied her ponytail around the CV1's back to keep it upright