Thanks for sharing this guide, I’m sure this will be helpful for many players!
You said you were using v0.7.0. In that version the artifacts were introduced. Is it possible that you had an artifact of purity activated while checking the conversion rate of the (X)+++ to (X)++++ resources? The artifact changes the conversion rate from 2 to 1 to 1 to 1. Without the artifact, you should also need 2 (X)+++ to create 1 (X)++++.