Maybe 'TAINT' as an kind of thinking entity would avoid eating pure nodes, instead of this it would 'shoot' it with tainted nodes, to 'defeat' it and then devour it, in cost of ditching the process of tainting the chunks that nodes originally came from.
I made a schema:
If a chunk contains more than lets say 3 tainted nodes, it could become a super tainted chunk, that can spread taint to few neighbouring chunks without using nodes, while being 267% more hostile and dangerous. An original tainted node from a tainted chunk cannot move and taint pure nodes. All world generated tainted chunks need to have at least 1 tainted node. Process of putting a tainted node in a jar should be very dangerous, lets say as dangerous as fight with Gaia Guardian tier 2 from Botania, to make it useable only in most dire of situation. On event of generation of taint chunk, few more blocks of neighbouring 4 chunks could also be taint biome, to avoid taint biomes from looking like rectangles.
What if we could use this to our advantage? Imagine capturing the node and putting it somewhere else, possible warding it so it cant spread or eat other nodes. But it would still have the ability to attract nodes to it for our benefit. Maybe normal nodes would have a weaker effect due to it being a single node but maybe 3 captured nodes (or more?) could be an ultra magnet. However, keeping all that tainted energy in one place couldn't be easy... Just hope it doesn't 'break free' and you know, release all of the built up taint at once.