Undead Jester spawn rate / drop rate of IBC

[Kaziel]

I've been at the spawn for TWENTY-FOUR hours now, continuous, no two hours here four hours there.

Two Jester spawns, zero IBC.
I've camped this dozens of times on live, this is NOT classic, the spawn rate is FAR FAR too low.
For comparison, I have never had this camp take more than four hours on live, and like I say I've done it dozens of time so I'm not talking out of my arse.