Over extrusion after a corner radius - Looking for fix

I’m printing a case (using PLA): From the build plate the case sides rise-up via a radius - coming out of the radius it’s adding a few layers that look over-extruded e.g. pokes-out from the case side - See attached . . .

Any ideas what might be causing this?

I’ve added Variable Layer Height with Smoothing set to 8. This has helped the quality of the radius but has not changed the issue in question.

Dave H.