This is really thorough, thank you so much! I think omitting the payslips was the biggest error here.
Also I'm not sure what type of tax reported income was used since my husband did it - I think his employment offer letter says an hourly amount if that indicates anything? I unfortunately don't know.
I imagine they require almost the same supporting documents as the I-134 (which I submitted earlier in this process at the embassy stage), and with that I had included the same stuff as this time, but this time I didn't include payslips. So I think that's the main thing I needa include!