However after testing on a cube to see what the corners look like I would go with 4 or 5. The cube starts at 0 and goes to 10 changing every 10 layers or every 2mm.
You can see the corner starts to deteriorate at a value of 5 and is completely gone by 10
At the higher k values the print starts to slow down quite a bit and the extruder is actually retracting. I guess I can up the jerk and acceleration to counteract the slowness?