[en] The vibrational mass parameters entering the quadrupolar 5DCH Hamiltonian are commonly calculated neglecting beyond mean-field correlations and dynamical rearrangement of the self-consistent field. The Quasiparticle Random Phase Approximation (QRPA) framework would allow to avoid the aforementioned approximations. However, due to prohibitive computation time, in particular when using finite-range interactions such as Gogny ones, the calculation of QRPA mass parameter is unrealisable. In order to reduce the QRPA computation time valence space techniques are applied, leading to a gain in time of a factor up to 30. The convergence properties of the calculated mass parameters prove their robustness toward the valence space limitations. On the contrary, the intrinsic QRPA outputs exhibit weak convergence properties, with deceptive appearance when inserting an inert core. Therefore, for the optimization of the valence space limits neither the excited states energy, nor the associated transition probabilities, should be considered for criteria of convergence. (author)