This has been a problem for so long and it still hasn't been fixed. No red-bar enemy should be able to "physics" me into infinity or cause my character to have a heart attack simply by getting near them. Even Sentinel shield titans with their super active and guarding can still be OS'd with a slightly off-angled melee from a phalanx's inward slam. A red-bar enemy should never be able to do that, under any circumstance.
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I do think the shields need some adjustments, as there are definitely some glitchy deaths from them, but I like how dangerous they feel when they work correctly. A shield smack to the face should definitely feel dangerous instead of just an inconvenience.