I've used SoapCalc in the past. The one I use now the the one of
SoapMakingFriend - purely because it allows you to save your recipes, which is handy for me because my note taking is appalling and my memory is shocking! :/
I'll use up the Babassu and then focus on Coconut Oil instead if it's much of a muchness.
The reason I ended up with Babassu is because I'm vegetarian and, yes, I know you don't eat soap - but I can't bring myself to use tallow or lard in my recipes as a result. Not a judgement on anyone; I just can't bring myself to do it. Then I tried some with Palm Oil and felt guilty for that (even though it was RSPO) and then I discovered Babassu (which I know is from Palm trees, but I was told wasn't destructive for animals)... and so on and so on.
I'm quite lucky in that money isn't too much of a problem (well paid job) - so I can afford to make mistakes... I'd just rather avoid them if I can!