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Soak times are often specified in minutes per mm cross section, for the purpose of making sure that the phase change has happened throughout, and not just the outer area. This is important when...

15 minutes is much too long for something as thin as a razor. A couple of minutes is long enough.

I don't use anti-scale paint or things like that.
I use the iron pipe method, and scale loss is minimal. You have to leave enough thickness for quenching, and that has to be ground away regardless,...

Usually about 5,5 - 6,5 cm
But the reason I ask is that the top one seems to be too wide for its 1/4 thickness

Is that scale in cm?

Ah ok no worries then. I could not tell from the picture.
My first razors were stock removal too. Your razor will be just as good as if it had been forged.
The main reasons for forging are:

1)...

How thick is the steel?
The width of a razor can be maximum 4 times the thickness of the spine.
That means that if your razors have a width of 30+ mm, they need to be at least 8 mm thick at the...