I choose this balance to take into account productivity modules, as the modded recipe is only 1 step instead of 2.
With foundries and legendary prod modules, you get
Vanilla : 2 ores > 175 holmium solution > 21.9plates, ie 11 plate / ore
Modded : 4 ores > 30 plates, ie 7,5 plates/ore, about 30 % less effective.
So my modded recipe is a bit worse than vanilla, but makes quality holmium more straightforward.