Hi Benjamin, I have the same melodic that you and I had the same problem. What I did to fix it was to reduce the opening of the reeds leaving a little space, but not completely close. Doing this responsiveness Reeds improve much. I fit so all reeds a Yamaha P32D a P25F and Angel AM37K2. Hopefully my advice will be useful. Sorry about my english, i am a Chilean guy. Greetings.