No i use the slider in the brush tip settings and increase the pixels that way. For example the brush I am using is by default like 300 px and I need to be increased to like 940 px so I move the slider up that way. I am not sure what those short cuts do lol never seen them before not sure if that will help not.

I also tried using the default brush size and then use the transform tool to large it up but that still pixelates and blurs the edges.