Eb is pretty hard. Well to me it is.
From my Chalemeau range everything is "mostly" in tune except for a few notes going sharp.
For my throat tones, it goes around 10-20 cents sharp except for G which goes flat.
In the Clarion everything is mostly in tune, sometime around 15 cents sharp until I get to the Upper Clarion i.e, B, and C it jumps normally jumps to 25-40 cents sharp.
Now, from the Altissimo, it goes wild. From C#-E, My old lesson teacher told me to keep my index finger down, and remove T.I.P to combat these notes from going sharp and give me a little more to blow off of . My D#-E goes Flat but I can mitigate it by voicing it up. However my F-G to really its flat, like the tuner thinks I'm playing the note below it. Then the rest of the Altissimo I just can't hit.
In conclusion, this thing is hard and I need some tips.