There are many options to make a fantastic soap!!! You could pick two of the herbs and make tea; and ground the other two and use as color and exfoliating agents. Or use 1 herb ground, 1 herb as tea, 2 as an EO blend. The options are endless.
I personally think using EOs alone when there are extracts, flowers, herbs, powders of the same focus ingredient are one dimensional. Adding actual herbs/additives add character and depth to your soap. Be creative!!!
For example, I've seen flower soap with the only thing "flower" used was FO. In my opinion flower FO does not flower soap make . . . why not use actual flowers and other things "flower" in the recipe, too