Here's a post I wrote about the black boost setting last year or so : https://www.bwmastery.com/blog/2016/the-qtr-black-boost-setting
If you buy my deluxe QuadToneProfiler tools the Quad Smoothing tool had a boost setting similar to the formula used in the QTR curve creation program that will allow you to boost all the inks. You can also manually edit the control points to boost individual inks.