There are some mitigating factors, but they dont fully account for the problem.
Sky games are more likely to be vs the top teams, so naturally you'd expect our results vs those sides to be generally poorer. However in addition to Derby and Leeds we've played Swansea, who are good but not great, and the pigs and rotherham, who are much further down the table.
One explanation I've come up with is that it's simply not about us. We do well when we're 'on it', which we usually are. How well we do, however, rests more on if our opponents are fully up for it as well. The better the team, and the more up for it they are, ie.the more they treat it like a big game, the more difficult it is for us. I think in our regularly scheduled games we take advantage of the slightly less heightened sense of occasion and pressure which surrounds those more ordinary matches.
In contrast, in the games on sky the teams we play are raising their performance ever so slightly, and we don't have the extra quality to overcome that.