After we had taken down Cenarius it was time for Xavius. We kinda thought that Xavius couldn't be so bad with the dmg now that we killed Cenarius easily, but we were wrong. The damage we took were insane that we had people dying in p1 and by the time we reached p2 we already had some healers go into corruption. After a few attempt we began to reach the end of the raid time, so I switched to my healer alt and the healing suddenly went much better. But wasn't enough as p1 lasted to long and we had a healer being corrupted in p2. Since the raid time was over we tried the next raid evening.
This time we tried again with our initial 3 healers and things went a bit better than last time. But we still had the problems in p2. After a bit of talking we found out the problems to some of the dmg and the corruption. We had the tank dispelled to close to the raid, as we hadn't seen the explosion range on HC was 25 yards, and that we got 2 big adds during p1. We then went with drums (as we lack mage/shaman/BM) in p1 and this fixed our problem with p1 taking to long and healers reaching 100 corruption in p2. But now our 2nd problem occured as we had no hero for p3, meant we had to reach it at a good time with people alive and a reasonable corruption.
After many wipes on 3-12% we finally got Xavius down. It was a hard fight, but we managed to do it.