My view is that given the modest suspension travel of a classic Morgan, particularly at the front, for some degree of comfort you need the initial travel to be soft and compliant. This would leave the suspension bottoming out too regularly though so some sort of dual rate system is needed, stiffening up in corners and under the more severe undulations.
If there is kingpin or bush wear this needs to be sorted as a priority or you are simply wasting your time with further improvements. Can't emphasize this enough.
Once done though the SSL RS (refinement system) front kit (as sanctioned by MMC towards end of Classic production) offers just the dual rate system mentioned above. Furthermore the main spring pre-load is adjustable with this kit allowing the ideal zero pre-load on rebound spring whilst static to be set and maintained. Any departure from this ideal will either a) if rebound spring under any pre-load, cause initial very high spring rate over bumps or b) if there is play between stub axle and rebound spring whilst static, allow excessive rebound travel leading to bouncy less comfortable ride over bumps. These technical facts are indisputable. The latter creeps up on you with natural main spring settling so there is a tendency to not notice until the play is adjusted out by whatever means.
My own path to these conclusions was after fitting SSL dual rate rear coilspring dampers to rear of my 5 link Roadster to replace the over stiff factory ones, providing initial comfort from rear but with less roll as well. This then highlighted the front deficiencies though hence their RS kit to compliment. I was told by Dan at SSL I was their first customer to sort out rear suspension before front though
