Maybe this is exactly what Pro mode means.
One setting fir 1080p@+30fps+hdr
One setting for 1080p@30fps locked with tons of eye candy+HDR
One setting for PS4pro 4k optimized (that is basically 4k checkerboard with as much of the eye candy you could carry over +HDR)
Can't really think of any reason why most devs won't make their PS4pro support work that way.