It's really important to learn where the runway/aiming point should be in your window. So when it's nice weather look predominantly OUTSIDE and quickly scan inside. Initially let the autopilot do the work but looking outside during the approach will eventually give you a feel to what it should look like.
Once you have this picture you can correct deviations faster than the flightdirector can tell you and you actually follow that instruction.
During approach (fully configured and on speed) the aiming point will not move in the window until the flare, offcourse the runway dimension changes but the aiming point stays in the same position.
So when you disconnect the AP, keep the aiming point in the same position in the window. This should ensure your flightpath is stable and help you cope with turbulence and other nasty destabilizing effects mother nature throws at us.
Coming through 200ft you start to scan between horizon, aiming point (both outside) and offcourse inside your instruments. As you descend your scan shifts from predominantly aiming point to predominantly the horizon (end of runway). This helps to judge your sinkrate.
Again you should always do this, autoland, pilot monitoring, pilot flying. This will again build your picture of what your sinkrate should look like.
Then follow the rest of the advice. When I make a banger I can usually trace it back to focussing too much on the aiming point in the later stages.