Another overlooked factor besides genetics is the actual receptor placement and the also the intracellular regulating kinases, for example, the inverse regulation of mitogen activated protein kinase (MAPK) from histamine , whereas androgens generally increase MAPK - therefore histamine and it's effects on leydig cells might actually be negative feedback itself, histamine stimulates gonadotropins at low-normal and normal doses, but at high amounts it may or may not produce estrogen problems..depending on the person and most importantly, body fat level!
That's the difference between a high histamine person who has higher test levels, they all will have higher metabolism regardless of hormone levels, but the irony is some escape this loop and end up having their cravings take control of them - and in this case that inverse regulation spoken of in the beginning comes into play.