Sorry for taking so long, didn't have the energy to take it out of the box again
Sitting with it right now, removed the insert and "free-handed" it around for a bit.
I noticed that the godrays actually are more prominent without the insert.
After playing around with it for a bit, the godrays are worse the closer to the lenses you are.
It actually looked fairly good and a bit sharper when I held the HMD a bit further away from my eyes.
Maybe that's why everyone have such different experiences, it all depends on how close your eyes are to the lenses, maybe some of us need thicker cushion on the insert?
Gonna test around a bit more tomorrow, too late to play something now