The red line for my TIT is 1750ºF. 1350ºF is way cold on my
airplane. I don't think I could possibly put that much fuel
through it.

Just curious. Is the M20M the one equipped with the
turbo-supercharged Lycoming that was retrofitted with external oil
lines to cool the exhaust valve guides a la the TIGO-541?

Yes.

If this is indeed the case, 1350 is only slightly cool on your
airplane, 1750 is way too darn hot.

I don't run it anywhere near 1750º, but that is the red line for that
installation. I cruise at 1600º TIT and climb around 1450º. I don't
think I can get it down to 1350º.

At 1600º, at typical altitudes, RPM and MP, I get just under 210 KTAS.
---
Ken Reed
M20M, N9124X