Carbon (via CO2) and light will impact weight. The rest is limited by these 2 factors and your environment -- any way you slice it.
if you don't change these factors, force feeding anything won't do much to improve results. a well-balanced diet should be baseline anyway.
maybe, some hormones can be an extra bump? outside of light and environment, a hormone treatment may increase yield... not unlike steroids increasing muscle mass, but again.. gotta have all the other stuff matching sophistication to get the most out of something like this.
Carbon and light are the 2 strongest correlating factors for yield. the rest is small slices of pie. this assumes a well-balanced diet is provided.
npk ca mg et al are not limiting factors unless we are screwing up feeding. these simply need to be available in a happy-zone of ppm's. Temperature and humidity will control rate of consumption. Following a VPD chart will control how much the plant feeds. providing max DLI relative to an increased atmospheric CO2 of 1200ppm will make the most of everything.
even if you don't tightly control everything like that, it's useful to know how it all fits together.