IMO, what Slough Feg need is a truly great, inspiring piece of work (a '10/10' type album) that will land them on the map. Each album is great, but always just misses the mark. They exist in "close but no cigar" territory.
I'm pretty sure I wasn't serious, btw, which is kind of given away by the fact that I made sure to note that I was serious. But seriously, I've had more luck getting people to like Slough Feg than I have any other Metal band.