you can lower the scope image down lower on screen it takes it further away from that ceiling and helps immersion so more in eyes view.. and also closer to your speakers ..whcih will only help lock audio more to the image
have you checked the projector output ? make sure its dialled back so only 12-16 FL for SDR and 30FL for HDR.. not need to be pumping excessive lumens on the screen to jsut bounce off
ps the grey screen will have lower gain and hence reflect back less light
its why it also looks duller... the whites on the white screen(eg the white clouds) look whiter.. on the grey screen they look grey...ie grey clouds
no amount of calibration is going to make the greys white unfortunately
oems to have hit the highlights too on the grey screen...