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Just about the best shave I have ever had is with a Merkur slant DE using Feather blades. The slant has the slice angle built in. You can also shave with a DE on slant and some people do it.
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Again, I don't diagree about the slicing motion.

If you look at the upper picture and imagine holding the razor and applying some force in the direction of the edge, half of that force will be...

Although I found the slicing motion in the barber's manual I didn't find the 30 degree angle. With the 30 degree angle the force towards you face is half the force you're applying to the blade. ...

Where not talking about a slicing angle. We're talking about the angle that's related to how far the spine of the razor is from the skin.

My suggestion was to REDUCE the angle. Increasing the angle can be expected to apply more pressure towards the skin, to require more total pressure to shave and to produce more of a scraping effect...

I learned from DE shaving that you benefit from the shallowest angle, because it lets you use the lightest pressure, minimizes the amount of pressure towards the skin and minimizes the scraping...