Anyway, the stall speed is dependent on the angle of attack
Eeerm. There's no such thing as 'stall speed', only stall angle-of-attack (I wish I had the proverbial £1 for every time I've had to post that on PPRuNe).
I've stalled the Yak at 140 kts and flown it at zero indicated air speed unstalled.
The only thing that stalls a wing is flying it beyond the stalling angle. Which for any given wing configuration (slats, flaps etc.) does not change. NOTHING else can cause it to stall.