It is highly likely that any "show" mead made with absolutely nothing but honey, water and yeast, is the result of a stuck fermentation!
I have had some fantastic sweet show meads, some very good semi-sweet show meads, but none that I can think of as anything more than mediocre or "weak" show meads that are dry. Since we know that complete fermentation of all but the weakest strength honey musts depends on providing the yeast with nutrients not normally found in honey, and even the addition of bee pollen, dead yeast, or other "natural" nutrients is enough to disqualify a mead for "show" categorization, the degree of attenuation of sugars in a show mead must is almost a totally random outcome.
I think it would be a good idea to eliminate this category. There is far too much left to chance when creating a show mead, and it really reflects the meadmaker's luck more than it does the meadmaker's skill.
That's just my opinion, although I am expressing it rather emphatically! ;D
Oh, and Launce back to your question --

-- the tannins sourced by the tea will in time mellow out, so even your rank tasting result pre-backsweetening, might have smoothed out to something interesting, had you waited long enough.