An attempt to simulate 2.0 spawner health increase with evolution for my own 1.1 playthrough.

By default stock biter spawners scale up to 900%, explosive biter nests to 400% and arachnid bug holes to 700% Anything else should scale to 300%
The health value shown by the game and not the added UI only serve an esthetic function and can only be used to roughly gauge the damage you deal.
Doesn't really support health regeneration so the added extra health does not replenish but every nest should at least be able to regen up to its vanilla max health.
Only works on newly generated or spawned bases (you can regenerate them with something like Chunk Eraser)

Based on crudely rewritten code of the BiterShield mod by suumani
Can cause bugs or crashes as it's not tested very well yet. May add some features later.