The simple fact is we really don't know how powerful these characters are other than Ragnos and Nadd are apparently more powerful than Sadow and Muur is apparently more powerful than Vong Krayt.
Ragnos since he's constantly hyped being the strongest in the Golden age of the Sith, which Muur predates and his era should be weaker. Nadd had knowledge of the Golden Age from Sadow, and while Muur is more than likely stronger than Sadow I think those two are closer in strength than Nadd is to Sadow.
__________________ "Vader's pulse and breathing were machine-regulated, so they could not quicken; but something in his chest became more electric around his meetings with the Emperor; he could not say how. A feeling of fullness, of power, of dark and demon mastery -- of secret lusts, unrestrained passion, wild submission -- all these things were in Vader's heart as he neared his Emperor. These things and more."
Nadd and Muur do have feats that can be used. Ragnos is the most obscure here, although you can interpret his "most powerful of the most powerful" to mean that he was the most powerful Sith Lord up to and of his time, which would include Muur.
Also Ragnos amulet gave a huge boost to Kun and Ulic, far more than what Nadds teachings and stuff gave him.
__________________ "Vader's pulse and breathing were machine-regulated, so they could not quicken; but something in his chest became more electric around his meetings with the Emperor; he could not say how. A feeling of fullness, of power, of dark and demon mastery -- of secret lusts, unrestrained passion, wild submission -- all these things were in Vader's heart as he neared his Emperor. These things and more."
Those feats are minimal at best and don't truly display what they are capable of.
Also you could take the quote to mean that, or you could take it to mean he was the strongest prior to his death. Couple that with the fact that I believe it comes from a publisher's summary and I don't really give it much credence.
Wasn't there a quote somewhere claiming that Ragnos was as physically strong as Darth Vader?
I don't think "the most powerful of the most powerful" clearly refers to everyone to that point, it could just be every Sith that was living (which would include Vitiate, heheh...).
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As for the quote, it mentions him being the "most powerful of the most powerful". I think we can safely assume that "most powerful" refers to Dark Lords of the Sith, who are the most powerful Sith Lords of the era. Ragnos was the most powerful of them all up to this time.
I brought up that quotes existence years ago, the Vader and Ragnos comparison. Probs doesn't exist.
__________________ "Vader's pulse and breathing were machine-regulated, so they could not quicken; but something in his chest became more electric around his meetings with the Emperor; he could not say how. A feeling of fullness, of power, of dark and demon mastery -- of secret lusts, unrestrained passion, wild submission -- all these things were in Vader's heart as he neared his Emperor. These things and more."
I don't think it clearly encompasses dead Sith Lords, and it could be referring to his political power.
We do know that Luke was terrified of Ragnos resurrecting, claiming that "all Jedi everywhere will die". If we take him seriously we'd put Ragnos above JA Luke, but I don't see how Luke could know that much about Ragnos's power level, and Ragnos's spirit was pwned by Jaden Korr, so yeah...
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__________________ "Vader's pulse and breathing were machine-regulated, so they could not quicken; but something in his chest became more electric around his meetings with the Emperor; he could not say how. A feeling of fullness, of power, of dark and demon mastery -- of secret lusts, unrestrained passion, wild submission -- all these things were in Vader's heart as he neared his Emperor. These things and more."
Muur has enough to give a good impression of his power. Nadd has enough to make a reasonable estimate. Ragnos is the one who's wanting in terms of feats.