FYi... I did make use of your trick to use normal physics to flatten out the ramp pieces more exactly. It did prove very useful. However, it's still not perfectly flat on any of the pieces. But it is closer than using the coords to adjust. those station ramp pieces are very useful now
You can make them flat, just have to play with it by keep replacing it on a flat surface. Just change the physics back to phased and lower the ramp through the floor to see how flat it is... if it's not flat, re-lay it again until you get the desired "flatness."