It’s probably a bit confusing without docs, but alpha is the amount of “global” exchange throughout the whole system while
beta is the amount of LR exchange. If you would like 100% LR exchange you should set the
x_beta to 0.7 as currently you have 130% exact exchange at long-range.
If you are so inclined, a PR enhancing the documentation would be much appreciated. Where the docs can be found here:
Mixing code here: