Had the same problem on my 08 4 seater and that took 3 sets from MMC to get it anything like level and even then it sagged again, then the MMC changed suppliers and it was much better after that (4th set). The trick was to get the latest spec from the factory not old stock, they should all be good now. I then changed to a 2008 2 seater and that was low on the back so I fitted the latest 4 leaf springs but went to 4 seater as they have a different set and I am not exactly a lightweight, I also often carry luggage and use the car for holidays. I asked Peter Mulberry about this idea first and he confirmed he knew of 3 German Morgan owners who had also fitted 4 seater springs to a 2 seat car with great results. I had a concern the car would sit over high at the back but it does not and measuring the rear ride height compared with 2 new 2 seaters at a dealership mine was within 10mm. They have been on for 18 months now and give a very nice ride without any bounce. I run Koni Classics all round on the lowest setting.

BR Colin
Who used to be a Spanner Juggler