What year M103 are you running? What rules do you get for cams, bottom end etc?
Can you run a late (flat top) Bottom end with an early (high quench) head? That should bump your compression. Depending on how "Flexible" the rules are you could even run either .98 M104 pistons which I think have even less dish than the late 103 pistons or run a M104.99 bottom end in the block to get to 3.2. IIRC the M102 early engines had solid lifters instead of the hydraulic lifters but to be honest I never checked to see if they'd work in my M103 because I just went to M104.
Also when you go through the head check the valve guides, the thrust angles on the valves tend to wear them out pretty quickly.
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1993 190E 2.6 Sportline
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