In my experience, razor burn was caused by incorrect pressure (as noted above), and also by incorrect moving thru the shave strokes. Now, I take as many strokes WTG as it takes to be shaving a smooth (from that direction) face. One pass, or more. Then, and only then, I move to XTG. Etc.

When I emphasized WTG, often relathering and repeating WTG, two things happened...

- The rest of my passes went more quickly.
- Most of my razor burn stopped.