Has any of you attempted Prey on the Hunter since DDO went F2P?

A bunch of guildies and I have attempted it a few times only to fail on getting through the maze to save the dragon. Last night we split into 3 groups and made our way easily through the maze in about 2 minutes however that still was not enough time to save the White Dragon. The lead guys just entered the chamber when the dragon was killed.

I was under the impression that this was timed but now am thinking that it just depends how hard the mobs are hitting. We were in on Normal with a full party so I'm wondering if Dungeon Scaling may be causing this.

Has anyone seen or experienced this?

Looking for any good tips.