Lovely soaps! I especially like the first one.. So classy, and mica lines are flawless.
I have not been soaping long but I can tell you what little I've been able to observe, using EOs in HP. I've never tried FOs as
@Chris_S mentioned.
Yes, they're added after the cook and you don't need to use as much as you would in CP. As for sticking "better" I have no way of comparing, but what I can say is that mine have stuck at least until 2-4 months. I use very less, maybe 1/2 the recommended amount for CP in the calcs, for my HP soaps.
The soap I have that's been curing longest (since mid September) is scented with a blend of geranium, elemi, and I think a lil Rosemary, and today I can tell you the bars still smell of geranium. This batch had fuller's earth instead of kaolin clay.
Another bar from September had lemon, Rosemary and tea tree, but since I used neem oil it pretty much masks most of it except for a hint of tea tree now. This also had fuller's earth.
I have some that are younger, since November, and those have Cedarwood and spearmint among other things, and a faint minty smell is still there. No fuller's earth in this batch though.
I remember neither smelled exactly like this when freshly made so EOs do kind of morph too I guess and also some others in the blend might have faded to leave those to stand out.
I can't tell you yet how they'll be at the 6mos mark, sorry, but I suspect more fading lol I can update in two months if you're interested.
Also, I noticed that none of these scents stick to my skin after the shower, unlike some soaps that leave a hint on you afterwards. Could be the amount I used or could be that they just don't.