The correct spelling of "more progressing" is actually "more progressing." The phonetic transcription of this word is /mɔ:r prəʊˈɡresɪŋ/ which means that the first syllable is pronounced with a long "o" sound followed by a short "u" sound, while the second syllable has a stressed "o" sound and a softer "i" sound. The word "progressing" is already in the present participle form, so adding "more" before it does not require any additional spelling changes.