Hmm, weird. I still need to use outlineWidth = 4 to get the desired effect for the font if I downscale my rendertarget and text. I’m still new to rendertargets so I might be doing something wrong here.
Rendertarget draw if I clear the graphicsdevice with a white color: (all text is now drawn at scale 0.25f)
Rendertarget draw with the applied shader (outlineWidth = 4)

Rendertarget draw with the applied shader (outlineWidth = 1)

