MabiPro: The Authentic Old-School Mabinogi Experience

I have my Playing Instrument at 99% at Rank E. No matter how many times I practice or fight with the instrument, it won't let me reach 100% nor give me that option to rank up despite having the AP to do so. Consequently, I can't finish my music quest that requires rank D instrument playing to complete it.

I've tried looking for solutions in general all over google and tried my own ideas, and nothing has worked. Please help, thank you. x.x

What condition(s) do you have left? Can you screenshot? Have you played a scroll that's 2 ranks or more in difficulty, above your current playing instrument rank, and got a perfect play?
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Discord: Tonkatunk#7079
https://github.com/Tonkatunk/Mabi-Pro-Lazyfae-Mods