A few weeks ago, I started getting excellent signal on the S2 transponders also. Without changing from the normal skew, I'll usually have at least one of them coming in reliably, and occasionally all four. (The last and worst one to come in is always, as before even with the skew modified, the one with Universal Sports -- 11840.)
They must have increased the power at the uplink. The new satellite is supposedly not in place yet and won't be til next year. Also, when I first started getting the higher signals, I was still getting some of the non-S2 transponders on both horizontal and vertical with the non-modified skew. Now, I don't, but I switched LNBs in the meantime, so I'm attributing it to that, since I've seen someone from SES confirm on another board that the satellite switch hasn't happened yet.