This is normal in the same way whistling is easier in higher notes and as you go lower it gets harder to project the note out (I mean the act of whistling, not singing in M3 or anything like that). My courses The M2A method and Mastering The Illusion not only contemplate this happening but tackle it and resolve it. Let me know if you need a discount or something in DMs. But if you can't buy them just don't give up, know that this is normal and keep going, it's just you're in the last stage that gets resolved - and it seems very counterintuitive or contradicting, but that's only from the old logic/POV from M1 :-)