Try the following out:
With these settings the pressure applied to the tablet will change the width of the stroke, so you'll have to decide what size the brush should be set at for your use. I used the Felt Pen with these settings to create the following image, which seemed to work out pretty well for me.
1. - Set the Paper grain for the layer you are going to ink over to the "Cell" preset (if you want the paper for the layer to be white, put it's "opacity" setting to 100%).
2. - Select the "Felt Pen" (Marker) and change its properties to the following:
• Pressure: 50%
• Softness: 90%
• Wetness: 50%
• Art Pen: On