Here are some pictures taken during a Flight at 11,600’ showing 66% horsepower. Would this work for you?
CHT highest was 335 lowest was 323
Oil temp looks about 200
Manifold was about 19.5
OAT -7c
For DA of 10,983 as calced by the 430
TAS 144 knts
My ground speed was 191 kts
Tail wind was 47kts
These pictures were at 2590 rpm

This is one of the flights I got to thinking about how the PowerFlow is made and how it may be robbing power at low altitudes. I often get about the same speed up high as I do down low and I think it is because the way the PowerFlow is designed. It uses smaller diameter pipes than has been shown to be optimum at sea level. According to the Flight testing done here goo.gl/e3Sbh8 by the CAFE Foundation.

Once you have proper aluminum baffles, as in Gary Vogt’s, you can easily adjust individual cht to equalize them by adding aluminum tape to the front cylinders like this

Our Tigers cooling systems were designed for worst case scenario Which is slow climb 100 deg day. So once they are working as designed the issue for increased performance in cruise or racing becomes how to reduce the mass flow / drag used for cooling….