Your original claim implied that you believe this is because lower IQ equates to a lack of consciousness, which as I've already described cannot be objectively determined and is therefore a poor metric. If I understand you correctly, you are now saying that it's really the species that determines consciousness, which is equally invalid.
Either you are taking it on pure faith that certain species have consciousness and others do not, in which case there is little point in further discussion, or you are trying to claim that certain species are worth more than others because they seem to have a greater aptitude in certain categories. For some reason, this does not apply on an individual basis. How convenient for you, then, that these categories align perfectly with all the areas your species has great aptitude!
I invite you to consider this possibility: Your belief is not based on rational reasoning, you are just rationalizing your behavior.
You are not making rational logical arguments. You have started with your preferred conclusion and are employing rationalization to justify it. Every time I show you that your philosophy allows for things you find uncomfortable, you move the goalposts.
Case in point:
>Also, discussing whether or not I would eat a human is silly because I can't go to the supermarket and buy human flesh. So, let's keep this discussion away from meaningless hypotheticals.
This is a copout that means "I am afraid of what my philosophy actually means, so let's just ignore it". You could easily acquire and consume an infant if you wanted. There'd be severe consequences for doing so, of course, but that doesn't mean you can't do it. People do do it. None of that is relevant to the question of whether or not it is morally permissible to do so, now is it?
But you, you're not interested in making sense. You're uncomfortable, so you rationalize. Oh, it's not ok to eat infants even though they're well below my IQ threshold, even though it's completely possible, because they aren't sold in the grocery store!
Please.