I don’t understand how point 1 is possible—sure, given the model the maximum could be higher than all animals, or even than all humans, but this contradicts my experience. My experience is that children suffer more intensely than adults, and given the emotional complexity of many higher mammals, they are in those terms more sophisticated beings than babies, if not toddlers.
Regarding point 2, yes, that could reduce average suffering, which matters for average utilitarians, but does not mitigate experienced suffering for any other beings, which I think most other strains of utilitarianism would care about more.
I think the adult suffering from anticipation (and from uncertainty) is limited, via both contextualization and hedonic adaptation. I’m unsure how the balance of intense pleasure / pain works for children. They may experience pleasure more intensely, but I don’t see it as much. And it’s plausible that animals also experience pleasure more intensely, but I’m agnostic about that claim.