Only some guys have this issue. Seems to be genetic.
RBC production seems to be linked to anabolic state.
HTC and RBC can be ~43-45 with low-T and for most, increases of ~5 can be expected.
For those affected, they need to avoid higher T dosing that is fashionable with some docs and clinics the last two years. And avoid vitamins and 'enriched' foods - rice, flour, breads, cereals etc. Some will benefit from donating blood if they are able to do that.
Humans hoard iron because fertile women have blood loss every month and males are a small deviation from the female blueprint. Males do not need any extra iron. But if iron status is low, we need to consider that there may be a low level GI blood loss and the best way to rule that in/out is to do an occult blood test that looks for blood in your poop, that is not visible - occult means hidden.
Some males have a real problem with iron overload that can have serious consequences.
When you have a high iron meal, some nutrients and vitamins will be bound up and not bioavailable. Adel Davis wrote about such things over 40 years ago and described how high iron foods were given to volunteers too induce Vitamin E deficiency so the effects of that could be documented. But it seems like the negative effects would be a lot more wide spread than that.