Galadriel's power

[Boromir88]

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Then again, at Tol-in-Gaurhoth Sauron was still not humbled by having had his physical shape destroyed and could be assumed to have been stronger than his recently re-assembled 3rd age self.

Yep, each re-building that Sauron had to go ended up weakening him. So, technically if you were able to kill Sauron's physical form enough times there would be a point when he simply wouldn't be able to rebuild:

After the battle with Gilgalad and Elendil, Sauron took a long while to re-build, longer than he had done after the Downfall of Numenor (I suppose because each building-up used up some of the inherent energy of the spirit, which might be called the 'will' or the effective link between the indestructible mind and being and the realization of its imagination).'~Letter 200

Now as for Sauron and his forces , that is an entirely different question, isn't it? Which forces are we talking about now?

And there is the problem with simply trying to kill Sauron enough times...he's up in Barad-dur and Denethor rightly believes he's not going to be leaving any time soon. Sauron's got enough soldiers at his disposal to rule Middle-earth for him.

With Galadriel, it depends upon which one we are talking about. In UT: The History of Galadriel and Celeborn, Christopher says that his father expanded both Galadriel and Celeborn's power, and roles in his later writings. So, I would argue that the UT version of Galadriel is more powerful than LOTR-Galadriel...maybe that changes things, maybe it don't