I'll be honest - I didn't actually think it would be THAT bad!
I'll be honest, I feared it would be.
If it cures out several months, lather has the potential to return, a little.
7% superfat is going to inhibit lather some, on top of a full butter soap. Butters inhibit lather too.
Now. Honestly in 6 months it may make a creamier lather. I did an experiment with my tallow when I first started rendering, and an experiment with a salt soap using avocado puree (almost no lather that one and could knock someone out with it it was so hard!). Experiments are how we learn and teach others, so kudos for trying something different!
I'd recommend as a tweek
Keep butters near 50% (for this experiment), with cocoa lower and used just to harden, avocado butter to condition, 6% castor to stabilize what lather you do get, a lower sf, at least 3% to help boost the bubbles, some coconut and olive. Here's a simple example.
I don't think a high butter soap is as conditioning as you're thinking. To make an awesome silky conditioning soap, use lard, some avocado oil, castor and coconut that's very low, maybe olive or almond oil to round out the rest, and I think this'll be better than a high butter soap personally.
The screenshot of the entire thing was blurry when I tried to attach it. These are oils and their % with the quality numbers. Remember I'd recommend 3% or even 2% sf, just be careful on small batches measuring correctly.