The only thing that You could try is to raise nozzle temp even further. That generally reduces stress in the extruded filament. That’s also why printing slower usually helps. When not melted sufficiently the plastic still contains stress when it’s layed down. I would probably try to see what happens when you max out the temerature to 300°C. Some PC filaments go up to 310°C.
Next thing I would try is to change the nozzle to a 0.6mm and raise first layer thickness to 0.4mm.
As previously suggested check the brim distance. It should be at 0mm. An inner brim only helps if your part doesn’t have a bottom. So, if not, then use that, as @ant proposed.
Warping oftentimes depends on the model itself. When the model doesn’t contain features that even out the stress, it suddently becomes harder to print. In this case the warping occurs because the walls are very flat and they pull the corners towards the center of each wall. I would check if there is any way to modify the model to get rid of the flat walls, unless it is really necessary. Vertical slots would reduce that or add some irregular features. These features don’t need to punch a hole into the wall.
If you have been using only gluestick so far, I would try something else like the woodglue+water mix.