I think you want to set "line width" for the second extruder.
Also note that PVA can absorb water and when it does it starts extruding lots of steam and the pva comes out snapping/hissing/popping and it doesn't work so well. You can bake it back dry again on the heated bed under a towel for several hours - do a test sample fist to make sure you don't melt it and ruin it.
Also note that PVA sticks to glass and other PVA reasonably well but will not stick on top of PLA at all (well- it barely sometimes sticks). So there is a feature called "horizontal expansion" that should be set to 3mm by default to help the PVA go "all the way down" to the glass. In other words the support in this donut hole should be connected to side walls that go down to the glass. So maybe you need to increase horizontal expansion.
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XYZDesignPro 70
In the Shell section of the settings you can set the wall thickness and line count of Extruder 2 to any count and thickness that you may need. Also you might consider purchasing a 0.6 BB core for you support for thicker walls.
If this part is just a threaded nut, perhaps you should consider printing it laying flat?
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