I'm not really a fan of castile but I need one for my range and am trying to get it looking as well as feeling as good as possible. I have seen some really pure white castiles, but mine always turns out a creamy yellow. I do split method milk soap, could the milk be the reason (although milk is added later, not directly to lye)? Or is the type of olive oil the issue? I have been using 1-year-old EVOO (sourced from local farmers, not supermarket brands).