If it's any consolation, Lilac was the very first FO I ever bought, and OOB it smelled EXACTLY like the flowers that I cut from the yard in early spring. I felt so fortunate to have stumbled onto a perfect scent on my very first try! and then I soaped it. Y. U. K. !!! It smells like a greasy version of little old lady soap! Can't tell you how disappointed I was. My family all thinks it smells "as good as grocery store soap", but it's very offensive to me, even after several months cure.
We heat entirely with wood, and keep a kettle simmering on top of the woodstove to humidify the air. A few drops of the lilac FO on top of the simmer water makes the whole house smell like spring, so that is how I'll use up all 8 oz of the doggone stuff! Something about the synergy with lye and oils just ruins it.