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Pressure is also force to surface area. So if you use the same force and same angle, the smaller area touching your skin (as in a curved edge vs straight) will exert higher pressure from the cutting...

For me, it's mostly the soap and the honing, but I also had to adjust pressure a bit with the smiling edge. The smaller area touching any part of the skin feels a bit more aggressive, so I use less...

I completely agree. The technique has to be a bit different with a smiling edge. I should also mention that I have very sensitive skin.

The smiling blade is easier in some areas, but I generally get more irritation with a smiling blade, not less. I have a few of both types, but my very best shavers have a straight cutting edge (I...