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There is something extremely wrong with FNSL in ACCC. I have noticed similar issues with solving ACCC with FNSL where blown up cases reported meeting convergence even though mismatch was in the thousands. One thing that was found to somewhat work is to solve your power flow case with the exact same settings you intend to run your in your ACCC analysis. I.e. if you setup your case moving shunts, taps, and PSTs with FNLS, but run your ACCC analysis with everything locked with FNSL, make sure to solve your case once with everything locked using FNSL immediately prior to running ACCC.