No and that's not the point.Is English your second language? Your post is very hard to read.
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The flat response curve refers only to DHT levels in the skin and in the blood.
The sides may be due to the dozens of other reactions affected by finasteride, completely independent of DHT levels in the serum and in the skin. They don't necessarily have the same response curve.
However once you make it to 1 mg, it's plausible you've inhibited everything.
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The flat response curve is almost flat for the different dosages. When you think there is a very tight boarder for some people with regards to side effects, you do understand that doing a melting pot of all these dosages does not make any sense. 5mg is different than 0.25mg.