Steve, I had suplex fitted to my old +4 at the front. For me it stopped the nodding dog syndrome. Seems strange for me that fror you it has got worse.
I agree that the SSL (Suplex) front suspension system should remove the nodding dog syndrome. It is specifically one of the things it was designed to do.
Once adjusted correctly it does not require any further attention for a long time. It may need to settle in a little and then be checked and/or re-adjusted after an initial short run of say 50 miles.
To check the correct setting of the spring adjusters you must have the car on a perfectly level surface and have the front wheels dircectly ahead. I have checked mine by driving straight ahead and bumping the brakes gently a couple of times before stopping to bounce the front end. At that point the lower springs should be just pressing on the bottom of the sliding stub axle. They should be so that you can only just turn them by hand. If not run the car backwards and forwards and check again.
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