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I've done that, it still just tries to fit ignoring the hyperfines. It ends up changing the A and AStrain values so that the hyperfines aren't visible at all.

I've been ripping my hair out trying to simulate a spectra I have of a Copper(II) bipyridine nitrate sample. I can simulate it fairly well if I ignore the hyperfine interactions: https://scontent.xx.fbcdn.net/v/t1.0-9/20228632_1634146159929604_434606683519206008_n.jpg?oh=6e5f6372283f683cf10440d99311...