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Are you adverse to swapping to PMO ITB EFI? There's a significant amount more airflow to be had using ITBs as they aren't impeded by carburetor chokes. The mid range issue could be dialed out.
I wouldn't go to a larger a much cam if you are looking for more in the range you quoted. The DC65 is basically a GE60 cam but with about 1 or 2 degrees more duration+more lift. I'm a big fan of the DC65 cam.
With 104 race gas you can certainly run more compression, 12:1 is not unreasonable. Mahle does not stock really anything these days. Your best bet is to use your current liners and have someone like JE make a custom higher compression set of pistons. Steve with Top End performance in the LA area has a ton of experience with custom Porsche and Ferrari pistons and I'm sure already has designs for what you might be in the market for.
Sounds like a fun car and class
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