Please note: horizontal expansion is default in the PLA/PVA profiles. The default profiles are really good, I recommend not to experiment with settings before you have seen good results with these.
See my pictures here
By the way: if you want to get rid of any changes that you have made in the "Custom" tab with all the settings, click the drop down box, and select "discard current changes".
This is expected behavior. PVA sticks well to Nylon but not as well to PLA. There is a feature in cura called "horizontal expansion" which makes it so the PVA can also stick to the bed and gives you good results. Note that PLA on top of PVA works MUCH better than the other way around.
So I recommend for this print, turn off brim (you don't need it for such a small part) and make sure "horizontal expansion" is set to 3mm (the default) for the PVA/support material.
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