One way to assess the extent of vibronic coupling is by measuring the width of the spectra before accounting for environmental broadening. Compared to FTFC spectra computed with implicit solvent, the FTFC spectra computed in explicit solvent showed stronger vibronic coupling (larger average FWHM) for NBD but weaker vibronic coupling for NR and 7MC. Errors in the simulated lineshape FWHM values can be traced to the underlying electronic structure methods and the extent of vibronic coupling for each method. We find here that the choice of density functional theory affects the lineshape, with more exact exchange tending to lead to stronger vibronic coupling and broader spectra NR but slightly weaker coupling for NBD. We also find that the use of the TDA, compared to full TDDFT, can lead to more narrow vibronic spectral lineshapes in some cases.