In checkFeatAdjustments, the first check is for the phrase "Increase your X score by Y to a maximum of Z" that one seems to work fine for various values of Y.
It also does checks for the following phrases for ability score modifications. In each case, it ignores the value of Y in the text, and is hard coded to adjust the stat by 1, even if Y is not 1.
"Increase your W or X score by Y, to a maximum of Z"
"Increase your V, W, or X score by Y, to a maximum of Z"
"Increase your U, V, W, or X score by Y, to a maximum of Z"
"Increase the chosen ability score by Y, to a maximum of Z"