The problem is the PIT Bosses are out of balance in the mid tiers (30 - 80) and have so many one shot mechanics you have only 1 or 2 builds per class.
Boost this post - it has suggestions for this and other fixes:
The problem is the PIT Bosses are out of balance in the mid tiers (30 - 80) and have so many one shot mechanics you have only 1 or 2 builds per class.
Boost this post - it has suggestions for this and other fixes: