Comparative is for two. Superlative is for three or more. Do not stack more and -er, or most and -est. Faster than the other section. The fastest of the four passages. Comparison words as a set are in comparison words.
Two versus the group
Two scores, two drafts, two methods: -er or more. A set of three or more: -est or most. The better of the three is the usual miss. Short adjectives take -er/-est: high, higher, highest. Longer ones take more/most: more careful, most careful. Never more faster or most highest.
Less versus fewer is a different count split, in fewer versus less. Adjective versus adverb form is in adjectives versus adverbs. Diction overall is in word choice.
The bottom line
Two: comparative. Three or more: superlative. Pick -er or more, not both.
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