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Symmetry conserving density functional theory (DFT) basedno-core-configuration-interaction framework (DFT-NCCI) is an excellent tool forprecision calculation of diverse (pseudo-)observables related to isospinsymmetry breaking from elusive isospin impurities trough isospin corrections tosuperallowed beta decays to mirror- and triplet-displacement energies andmirror energy differences (MED) along rotational bands. In our recent work[Phys. Rev. C {\bf 106}, 024327 (2022)] we performed axial DFT-NCCIcalculations and failed to reproduce a sign of MED in positive-parity bands of45Sc/45Cr T=3/2 mirror pair what casts a shadow on credibility of the model. Inthis work we aim to perform a thorough analysis of this case with the focus onsensitivity of our predictions with respect to: (i) low-energy constants (LECs)of our effective contact charge symmetry breaking (CSB) force and (ii) nuclearshape. We demonstrate, among the other, that inclusion of triaxialpositive-parity ground-state - which is actually the global positive-parityminimum in our unconstrained mean-field calculation - in the DFT-NCCIcalculations instead of the axial one used before leads to MED which areconsistent with experimental data concerning both their sign as well asmagnitude without any need for fine-tuning of the model's LECs.

Sensitivity study of mirror energy differences in positive parity bands of T=3/2 A=45 nuclei