I got it to work but it was pretty slow. I tried using the x-men config posted on this thread but it didn't make a difference. But maybe I set it up wrong. I decided to leave the 4mg games for now and generate the rest first - it was getting tedious and frustrating. Hoping to finish generating all the non-4mg that I want tonight or tomorrow. Then I'll tackle XvsSF again. I'm planning to start from scratch. I'll use the 2D Fighter config posted by @xYuunax . I'll also try over-clocking. Not done that yet with any NSPs. So if you wanted to try again this is what I would suggest. Will let you know how I get on.
I'll PM my copy of XvSF if you like?