These two words are not the past tense of verbs. Wick is a noun, and wicked doesn't seem to have anything to do with wick, while nake is not even a word.
Since my laptop crashed, I recorded this clip with my netbook. Guess the sound effect is different. 後部發音 stays a mystery for me up until this moment.
What about following NewVoice姐姐's convention and call me 肖姐姐? :-)