Involuntary bending on the high end

Hello Dave,

I have been practicing blow bends for a while. I know this is way above my level but I know they take time to master so I have included them in my daily practice.

However I have noticed that I have developed a bad habbit, that I need to correct.

I is a little bit frustrating, because I thought I had that figured out, but I have started having troubles with involuntary bending when playing on the high end especially when tongue slapping, especially on a C harp, but on other harmonica keys as well.

Can you please recommend me some exercises I could include in my practice in order to correct that?

Many thanks in advance!

Angel