Zing are you asking about increasing how hard the bar is or how long it lasts? The higher the coconut you use the more soluble your bar will be....
Switch out olive with another soft oil that's higher in stearic and palmitic maybe? I use RBO personally. Your avocado has em enough though, for a soft oil.
I don't use palm but the amount you have is what I usually use cocoa and shea (combined to get that %). I've gone higher too but the downside is a longerish cure otherwise you won't like the lather if you're used to this one.