I use a lot of air lately to fix several things and it has been working, I can practice as long as I want now...(lucky neighboors)
But one thing I keep failing is tonguing and keep the right pitch, even when I do practice is slowly it is really bad,
This happens when I play scales, and the last 3 notes of the scale are lower in pitch except when I play with more air and it gets louder.
At loud volumes it is getting a lot better but at softer volumes I can't get the air going and the pitch is lowered...
This is the worst around the G to E in staff, in higher and lower register it seems easier... dont know why,

Suggestions on cause? solutions? experience with this?
Please share