Hey @xemenis - welcome to the forum! So glad to have you here. The map you have I correct. Probably what you are experiencing is very common with beginner accidentally bending down the -2. This usually happens because the back of the tongue is raised in the back of the mouth like it is when we say “kk” (and/or the jaw is not dropped, which is evident if your top and bottom teeth are too close together.)
Drop your jaw in nice, relaxed “aw” vowel shape with back of tongue lowered like it does when you yawn.
Finally, don’t draw too hard. Just a nice consistent airflow does the trick.
LMK how it goes.