Jeffrey,

Well I didn't think it was too low a power setting. What do you prefer to
use?

75 percent as long as it's available, all that's there when not. And yes, it
could be too low a power setting influencing the scavenging process through
lower temps and pressures. But the main culprit is likely not enough leaning
on the ground.

As for Deakin's articles, I've not read them, thanks for the tip on that!
But which one should I start on?


There's a trio in succesion dealing with Mixture, Prop and Manifold
Pressure, IIRC. The latter is easy to recognize by its title, which is
"Manifold Pressure Sucks" (get it? - if not, you will after reading).
There's a general one dealing with engine management older than those. These
are the foundation. But basically, you'll be ok if you read all of them in
chronological order. It's a lot to read, but well worth it.

--
Thomas Borchert (EDDH)