Peter, You mention that Robert L doesn't have the same spray issues as you have with almost the same car. Some trad owners reported that they have the spray on the inside, others haven't.
I don't think that the cars are so different within one product-line, there must be other reasons. The biggest difference that I can imagine then is the road- and weather-conditions of the drive. Not everyone is driving top-down under the same conditions. And the second aspect is simply awareness. Some people focus on squeaks, others on rev-hanging, handling or spray.
A Morgan is far from being perfect. That's why I like it.
