Rolling For Points Buy

1. Set highest and lowest rolls to min and max available ability scores, discard highest and lowest rolls.
2. Distribute the remaining rolls based on value.
3. Allocate points to the remaining 4 abilities based on the distribution.
4. Adjust scores to avoid wasted points.

Note that due to randomization occurring in specific scenarios some solutions are unstable.

As a general rule though, the vast majority of solution are stable.

Ability score-points cost based on 5e Point Buy Calculator default values.