[Inkscape-user] How to set default fill and stroke for texts?

I'm a new Inkscape user, I'm using it to draw some simple network diagrams.

I seem to have got my text set up so that that default fill is 'None' and the stroke is not 'None'. For the small size text I'm using this produces rather rubbish looking text. I can't work out how to set the defaults back to what they should be.

Clicking the 'Set as default' box in the text pop-up doesn't help, as expected that sets the default font style and size.

Can anyone help?