INSTEAD of being "a bit low" on the profile for a CDFA during a NPA with actual limited visibility, it makes better sense to do the opposite -- be "a bit high".
Reason 1: Being so, you're bound to reach your MDA at a closer distance to the runway -- and therefore have a better chance of eyeing the runway --than being exactly on the profile. Sometimes less than a quarter of a mile more is all you need to be visual.
Of course, "a bit high" was in quotation marks to emphasize it being a subjective thing, and that you get above the profile just enough that the required sink rate after becoming visual from your usual 700FPM becomes only around 900FPM.
Reason 2: It plainly gives you a better perspective searching for the runway.
Cheers
