With regard to forward weight distribution, amplified squirt has to be of concern. How 4 oz. became the norm is a pretty good question. It would seem cue pivot points of 19 to 20 inches might create more balance, but undoubtedly the cue makers have developed averages from experiences of successful applications of their products. I have often wondered if in special cases, say breaking or jumping, if forward weight might be advantageous, as there would ordinarily be no spin applied.