@guy. Do you use the Autopilot Mode Selector set to LOC/VOR setting to capture the ILS, and after capturing the ILS switch it to G/S Auto or G/S Man (when the G/S is almost in the center of the HSI)? If I set mine G/S MAN, I find it is really severe in its attempts to track the G/S. Because of that, I prefer to use G/S AUTO.

Also. Have you tried using the default FS Autopilot commands to see if they help at all (if you aren't already doing it)?

@CaptainEd. I made this change in the aircraft.cfg to give me a better view (raised the seat a bit, so to speak):
[Views]
eyepoint=55.0, -1.6, 5.8  //55.0, -1.6, 5.55 About .25 feet (or 3 inches) higher.
Another thing to be aware of is this: IF you are flying too slow during approach the pitch angle will be too steep (the nose will be pointing up too high) making it hard to see the runway through the windshield. As a "general rule" if you airspeed is close to the correct speed for your flap settings and aircraft gross weight on approach, then the 707's pitch angle is about 3^o, and you can see the runway ahead of you very easily. I rarely go slower than 160 knots (IAS) during approach, even if I'm light (185,000 pounds).

Mark