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Less than stellar shaves when you're only four in is very normal. I know it's tempting to use more pressure, but it's still best to use none and clean up with your usual razor (DE, disposable etc)...

I agree, but the use of pressure with any razor, sharp or dull, will cause razor burn.

I'm guessing the OP, frustrated by the lack of whisker removal, tried to compensate with the use of pressure...