Because Truenamers can't catch a break even then, here's one of the feats meant for them:

Quote Originally Posted by Tome of Magic, page 229
Focused Lexicon
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Benefit: When you take this feat, choose a creature type (such as aberrations or monstrous humanoids). The DCs of your utterances are increased by 1 whenever you use them against creatures of the chosen type.
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Presumably, the red bolded sentence was meant to say "The save DCs of your utterances are increased by 1," which would make Focused Lexicon merely an extremely mediocre feat. But thanks to the omission of a single word, it is instead a feat that you take in order to make your Truespeak skill checks even harder for yourself.