I am not that knowledgable about Feminine fragraces but I think that you are doing the right thing by testing alot. Don't be shy about going back to the SA for more samples. That is why the perfumers put them out there.
It sounds like you like old fashioned but not too old fashioned. There is a woman at work who wears something called Nude. Works really nice for her. It reminds me of lace curtins made by hand with loving care. Something someone put their heart into. I see antiques but tastefully blended with the modern. Slightly sweet like the angelic smile of a young girl on a spring day. But mature like a woman who knows she is a woman and knows what she wants. I imagine her as being someone not afraid to be daring but also a bit reserved.
Don't worry. You will find that signiture scent. Even if you don't it will be fun looking. I know women like buying new things but I suspect they like shopping more because its like a hunt. Sometimes it is more fun looking than actually aquiring.
The ladies here can advise you more thoughtfully than I can and they are very helpful.
I myself have been trying Habanita and am enjoying it. Somewhat sweet vanilla but has an animalic undertone that I like and it doesn't overpower. Give Bandit and Jicky a try too
Most of all have fun
Best to you