As far as I've seen, there are 3 healing herbs: Fey Leaves, Woundwart, Vicar's Cap. Light = 1 of these, Moderates = 2 of these, Serious = 3 of these (As in, one sample of each). Could we perhaps get it tweaked so putting more than one of the same type gets you the higher potions? It would certainly lessen the pain of having to combine 1 of everything.
Example: 2 woundwarts = moderate. 3 woundwarts = serious. Yes, it's easier to make them then, but at least you wouldn't have to deal with the common situation I face when I end my day of collecting and find myself carrying like 30 woundwarts, 5 fey leaves, and 1 viccar cap. Therefore, my output becomes: 1 serious wound, 4 cure moderates, and 24 cure light wounds (assuming I'm actually succeeding on all of these). At least with my suggestion, I could take those 30 wound warts and turn them into a potential 10 cure serious or even 15 cure moderates. If you catch my drift.