Great reminder about using lard (or tallow) and full water instead of palm. If I use a rose or other known fussy floral, I go straight to tallow and use full water. That usually buys quite a bit of time. Avoid palm kernel like the plague with those FOs. Same with Rain FO. Yikes! That seized on me and the only reason I got it into the mold was that I did a simple layered design added the FO right before pouring each layer. By the time I got to the next layer, the first one was hard as a rock. Just incredible. Leather riced badly for me using my standard palm recipe, but it was perfectly respectable with tallow and higher olive.
It's late, and off the top of my head I can tell you that Champagne is wonderful to soap with. It's water white, and not a hint of acceleration, ricing or discoloration. And it smells awesome too!

Most straight essential oils are very easy to work with too, but they're more expensive and some like lavender don't always stick well in cold process.