You post this pretty much every time the game being at CWS comes up, but I'm not sure what it proves. The sample size is small enough that I'm not sure 8-4 vs 5-4 means anything real. I suspect is has more to do with the teams on the field in those games. Correlation vs causation, you know?
I think if you asked 100 UofL fans if they'd rather play UK at CWS or PJCS, at least 99 would say PJCS. I don't think the fact that UofL has a better record at CWS would matter one iota.
I do think that is a legit point. There isn't going to be much of a home field advantage for either team in this instance. Granted there is still some. If given the choice I'd rather it be played in Commonwealth. However I'm not concerned about playing in their stadium. In every game we've played against UL the better team has won regardless of the location. Not necessarily the best preseason ranked team but the team that wound up being the best. The home field hasn't influenced any of the wins.