I've been struggling lately with necramechs in iso vaults and certain bosses that can only be damaged in certain areas when using exalted blade.
I stopped shortly after Deimos release and had no issues fighting necramechs with EB back then.
Now it seems that if EB hits another part first the damage does not register even if it hits the weak spot after that. This also applies for the legs of the Jackal or the back of Lech Krill.
Along with that, do you have any adivce on hunting necramechs solo? I had okayish results with a slow Nova in 1 on 1 situations, but started struggling with fighting multiple mechs at once. Is there any weapon/frame (combination) able to get rid of them quick? I use slow Nova with Rubico Prime, moded for radiation for the mechs.