I am not a doctor or scientist either, my theroy would have to do more with the receptors than the weight. Most first cycles can start out on lower doses because the receptors are fresh and not used to the AAS that are being sent to them... the more cycles you do the more the receptors adapt to AAS therefore you need an increased dosage to get the effects. But again , that is just my Theory.......

Would definetly like to hear the VETS on this one.