I think that the CT has a different or can have a different setting for the stall limiter. Now, even though I have it off, I remember one time asking Slash I thinkif something was different cause I kept falling of the sky. I think he went and changed something and things got alittle more stable.
So, it is possible there is a setting effecting the flight models of all planes, but since Storch is usually in German planes and they have a much nastier stall than a SpitV, he sees it a lot more often or pronoun on the 109s and 190s.
Then again, I could be full of doo doo.
Edit:
That would require the existance of a bug that causes that effect even though the stall limiter is off, or it may be a value effectign the stall in general.