BTW:
I had performance problems in the battle with slow loading and lag, etc.
I removed the Stacking Offence disks and performance sped up, becoming smooth again. You can still ramp damage through his normal Siphon mechanics but that disk just slows you down.
On the other hand, You can still use the HoT disks + Premonition to give yourself constant foresight. It only saves you from one attack, but sometimes that's all you need.
Leader disk, Savior disk = 5 slots
Premonition = 4 slots
3x HoTs = 3 slots.
That way you can die once and come back. If you're using Zombie instead of HoTs + premonition, then a second Leader disk and 1 fewer HoT disk is probably the way to go.