Not recovering with bloodnotch

I am using bloodnotch unique jewel combined with immutable force so i recover a large amount of damage from stunning hits. I am also using petrified blood and some recoup to recover some more.

my es very low and i use valyrium unique ring so my stun threshold is based on es. I have tested this setup without immuable force and i get stunned constantly even in low areas.

Usually this works well and i can take damage at close range i have been using it for many maps with almost no deaths thanks to also investing in evasion, phys taken as lightning and max lightning res.

I opened a map which had an uncommon pack of cold spell using enemies with crit chance and multi necropolis mod. every time i encountered those monsters the projectiles would go right into my health and i would recover almost nothing. in the same map i could still be surrounded by any other enemy, and i had encountered necropolis crit enemies before. they would do only a small amount of damage that i could easily gain back with life gain on hit. just those cold spells would noticably lower my remaining hp about a third each projectile. i died 6 times so the problem is rather consistent.