Hi Lee,
Below are the results for the subs from my current project, measured in PixInsight.
Equipment: 4" doublet, 3nm narrowband filters, 15 minute subs and AZ-EQ6 (on average 0.5-0.8 arc seconds total tracking error), imaging at 1.33 arc seconds per pixel.
Site: Paddington in Brisbane
Ha: FWHM 2.5-3.3
S2: FWHM 2.1-3.2
O3: FWHM 2.4-2.7 (all in arc seconds)
Hope it helps
EDIT: these results are for best/worst subs for each filter collected over 6 different nights.