For anyone else that runs into this, I dropped this at the bottom of my custom.css to force a style on links in comments/posts. Currently, when they edit the format IPB uses <span> to do inline styling. This should override it. Not responsible for any issues this causes:
.cPost .ipsComment_content .ipsType_richText a span {
color:yourcolorhere !important;
}
.cPost .ipsComment_content .ipsType_richText a {
text-decoration:underline !important;
}
