Make Lings vulnerable to Shock/Cardiac Failure..again

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Changelings don't breathe, why would they need a functioning cardiovascular system?

because it's unbalanced that a ling can take 4 laser guns and survive? they didn't need a buff

Why? A laser gun has eight shots anyway, and a ling with negative health is still going to be slowed down and vulnerable for the beating that will finish them - it's just that on the off-chance they manage to escape, they'll actually be able to make use of their regenerative powers, as opposed to needing to run to the nearest medkit for the syringe of epi. A ling's regen powers were basically useless before, because any fight that goes badly for a changeling is going to give them more than a few scratches and scrapes, and once they're in crit they need to grab a medkit even after regenerating.