Thanks for the answer! I fly a Baron 58 and your comment describes exactly what we do. Since the main purpose of this topic is to talk about speed management regarding weight, the first thing that I was thinking was about Vmca.
We always follow the speed published by the manufacturer, the difference is the % of power we use to maintain the approach speed. Basically, the approach speed will be the same, with less or more weight. - Talking about light twins.
As an example, Flight Safety recommends flying base leg with 110 KIAS (Baron G58, visual approach). The Vref is 95 KIAS and Vmca 84 KIAS. The MTOW is 5,500 lbs.