Very long time since I've been fooling around in SF now,
but just a few thoughts around it:

If "Normalize" is a kind og taking the high level peaks
down without drag down the rest and vice versa, then it
should be used very carefully.
If it's so, the music often sounds "lifeless"... just as
when recorded in "automatic level adjust", weak parties
are rised (so are the noice), and higher sounding parts
are put down so everything don't sound natural at all.

But SoudForge are a quality software, so it's maybe not
what "Normalize" do other than protect the high peaks to
be distorted?

GJ