its not only about weight, its about the strength and power of your legs.
I know someone who is way way under the weight category for his springs and can bottom them out simply because he has powerful legs and great technique.
If you gradually lost weight you probably wouldnt notice the difference but then say you went down to 85 kg....until you tried some 90's or 100's and then you'd think wow. Nobody can say whether you'd bottom them out though.