I’m not sure I am understanding how 77% is totally awesome if tilted panels produce 90%, but could the vertical panel efficiency not be improved by putting some

I’m not sure I am understanding how 77% is totally awesome if tilted panels produce 90%, but could the vertical panel efficiency not be improved by putting some reflective material at a tilt towards the vertical panels? Also, couldn’t the tilted bi-sided panels also have some reflector send light to the rear side?