Another important result is the significantly decreased performance of MC-PDFT with tPBE (0.39 eV MAE) and tPBE0 (0.34 eV MAE) relative to NEVPT2 (0.18 eV MAE) for transition-metal dimers. Thus, we expect these systems to be a key target for future functional development. We then introduce a "down-sampling" approach using natural orbital occupancies to achieve smaller minimal active spaces that retain the accuracy of the larger initial DVS active spaces. Finally, we highlight that DVS-APC provides a similar accuracy for excitations in the two larger transition metal systems, MnO - 4 and [Cr(CN) 6 ] 3-. Promisingly, for these larger complexes, the performance of MC-PDFT is more in agreement with NEVPT2, suggesting MC-PDFT may particularly struggle with the diatomic dataset. Ad-ditionally, this work showcases the applicability of DVS-APC to CASSCF wave functions, whereas it has previously been used with DMRGCI.