And having used Mimic Tear to beat Astel pre-nerf for the Legend version and post-nerf for the weaker Yelough Tunnel version
What do you mean by legend version? The one you fight as part of the Ranni questline? If so, how is that version weaker than the Yelough Tunnel one? Naturalborn of the Void was perfectly fine if a bit tanky, whereas Stars of Darkness had a fairly bullshit grab that was very hard to dodge and OHKO'd at full health, 40+ Vigor and with defense+ talismans and heavy armour
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When you have nothing to say, quote yourself ~ Solfadore