Need to see a comparison shot of your weak reflections vs opaque ones that are as expected.
Yes some ray offsetting is expected but brightness should be the same.
Here is my test of 2 surfaces. Left is opaque, right is translucent.
In addition, the sheet closer to the camera on the right has opacity at 0.5 using vertex color:
both materials are the same except for the translucent one being translucent and “surface per pixel” lighting mode.
