Methods using smaller basis sets fared substantially worse on this benchmark set. While full evaluation of basis-set effects on Wiggle150 is outside the scope of this work, we scored two popular double-ζ DFT methods, B3LYP-D3BJ/6-31G(d) and wB97X/6-31G(d), and found that these methods gave markedly worse performance than their quadrupole-ζ congeners. Similarly, the r2SCAN-3c and ωB97X-3c composite methods were markedly worse than their non-composite counterparts. This contrasts with results on GMTKN55, where r2SCAN-3c outperforms r2SCAN-D4/def2-QZVP on relative conformer energies. We attribute this to the high variation in bond length, which likely introduces a small amount of bond breaking into the benchmark; double-ζ benchmark sets are known to be inaccurate for thermochemistry, 37 so their poor performance here is unsurprising.