Where did I say I knew everything? What I do know is, once you cool the evaporator to the point where condensate freezes, you've reached the practical limit. There are ways to change this limit, but most are impractical. You could increase the ability of the system to move heat by increasing the size of the condenser and/or evaporator, increasing the airflow through the condenser and/or evaporator, using hot outside air to keep the evaporator from icing up instead of recirculated air (but that kinda defeats the purpose). Obviously, some methods are more practical than others. Short of re-engineering the system, improving MB A/C brings to mind silk purses and sows' ears.

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1989 300 SEL that mostly works, but needs TLC