It's very high in nitrogen, but I am going to assume that the nitrogen will come from two different sources (ammoniacal and nitrate)...one of which is slower acting.

I'd use less of such a product than for woody plants. Excess nitrogen might cause artificially induced vegetative growth, which not only increases the chance for insect and disease problems, but can alter the flavors of the herbs.

Herbs thrive more on neglect than too much food and water. I've been growing for 15 years. Just curious why you are feeling the need to fertilize?
Blessings from the Garden
MLCH

From the three elements, N, P, K, the P(phosphorus) sticks to the soil for a long long time.
Th "K"(Potasius) is also partially stable. But "N"(nitrogen)
is water soluable and will be used up fast and will leach out quickly.

So, after fertilizing with NPK for a while, you won't need "P" or "K".
All you have to keep adding (slowly, continuously) is "N".

With most herbs you do not need extra "P" because you do not want flower or fruit, but just green top.

So, to summarize, in most cases you will need just the nitrogen(N), very sparingly.
I mixed a lot of wood ash that takes care of Potash(k) and also makes soil more alkaline
that most herbs like.

cyrus