I think your philosophy is probably fairly normal, it's just any attempt to simplify such things looks like an open challenge to point out corner cases. Don't take it too seriously.

Also I'm not fully convinced on whether animals' interests count morally, even though they do practically by virtue of triggering my empathy. Aside from spiders. Those can just burn. (Which is an indicator that animals only count to me because they trigger my empathy, not because I care)