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The psychological effect is the same. Everyone who starts playing with, say, Stinger hopes that "now I'll get a good draw... I'll crush everyone, and then write a pompous report."
Therefore, it makes sense to divide tournaments into "fun" and "determining the best." The second category includes FB, CIS... well, probably everything else. It's better to play mirror matches in these. And in the rest, let there be some variance; in my opinion, it's not critical.
And in both cases, restructuring the guild is not needed at all. This question arises from attempts to mix oil and water – the unbalanced gameplay of SoD and the need for a more or less objective determination of the strongest. It's better not to strain yourself and just keep them separate.