Why do you think this? What does total cue weight have to do with balance point? I have owned many cues between 18.4 and 19.0 that had balance points between 18.75 and 19.25 . Could your experience be skewed by cues with weight bolt systems or something?
A poorly distributed balance or balance point less than 18.75 and greater than 19.25 always feels awkward to me and is a catalyst for me to find it a new home quickly. That is the most common parameter I have discovered separating cues that I like from the cues that I do not care for. Kind of like finding the perfect bowling ball. When you have no stroke like me, you gotta have some kind of excuse.