Just wondering does anyone understand and can control the link between voltage and boost tables?

I want to be able to choose the voltage I want (any voltage) and choose the boost I want (any boost). If I run 1.175v I cannot boost over 1228 with 1 card, and 1254 with the other. I will use a hex editor if needed that's how I've modded my base freq, mem freq and 100% board power target but I want exact control over voltage vs boost.