Middle row to middle row with a level 88 PE uncrystalized Gaigel I'm getting between 10.5k - 11k. That's with a 1.25x pvp modifier (vs 1.25 as well).
Crystalize him, put him up front, and if he procs it's probably a 1-hit kill for anything in the row. Of course, you could put a betty or gorm in the back row with the same proc percentage and wipe the whole team.
However, we haven't been able to realize his full potential yet as there are no 5-man single line formations yet.