I cannot evaluate your concept of nihilism without further detail specifically your first posit and what you derive from it. However, the typical concept of nihilism argues that life is without objective meaning, purpose, or value, and that morality does not inherently exist. It argues that established moral values are simply contrived abstractions. This definition appears inconsistent with your a priori assertion of the good as perfection.
The first thing to know is that there is nothing simple about abstractions.
Again you provide little to nothing. An emptiness that seems consistent with nihilism itself. You reject ontology where infinity grounds finitude yet refuse to offer any alternative other then a first posit that there is no infinite. You argue that nihilism somehow allows for complex abstractions that allow you to define the good as perfection yet offer none of these abstractions. As a logical framework you are falling far short of ontology grounded in the infinite.
(Study of holy scripture) brings one to vigilance, vigilance bring one to alacrity, alacrity brings one to cleanliness, cleanliness brings one to abstinence, abstinence brings one to purity, purity brings one to piety, piety brings one to humility, humility brings one to fear of sin, fear of sin brings one to holiness, holiness brings one to Divine inspiration, Divine inspiration brings one to the resurrection of the dead.