Understood. The point that I thinki needs to be emphasized is that increasing the length of the lever has far more effect on the force than increasing the weight. And as someone has already pointed out, the weight of discs is so insignificant compared to the average adult, that increasing the weight of the adult would not make much difference, even if the throwing person were like a trebuchet. In fact, the increase in the weight of the person is likely to increase the weight of the person's hand, forearm, etc. proportionally, which is actually resisting the throwing effort, so there is no reason to think that weight increase will yield a benefit, and may result in a slower throw. But thinking about the trebuchet is helpful in understanding that the leverage provided by throwing arm length is especially significant as a factor.
You get bonus points for saying "centripetal acceleration" instead of "centrifugal force." Tha'ts a pet peeve of all of us physics degreed peeps.