I finally managed to digest that code, impressive indeed!
I can also see that it would be easy to make the entire function just 1 instruction in gold.
Veedrac also has the right idea about how to format conAsm. He puts the rd and con operations first which more closely resembles phasing, he spaces instructions so that it is easy to visually scan the code and he shows in comments the slot where the result go. I am not sure what the arrows at the end mean though.