For the problem itself - first off, as was said, make sure the fuel
system is set up correctly. You should be over 20 gph on takeoff
power.

I'm burning 27 GPH in take-off and climb.

For cruise, do you have the cowling cooling mod? [I'm guessing
yours is an Arrow III.]

No, I fly a Mooney Bravo. Sounds like you may have been discussing a
different (and specific) airplane and engine combination ?

Another option - run LOP.

Unfortunately, that isn't an option in the Mooney Bravo. I know about a
dozen owners and no one can run LOP. I ran LOP regularly in my previous
airplane, but this airplane/engine combination simply won't run LOP
smoothly and with reasonable temperatures.
---
Ken Reed
M20M, N9124X