OK, sounds like you have thought out a solution to the flow distribution.
Same question stands: What problem is being addressed with lowering the exhaust valve temps? Trying to lower detonation issues on the center cylinders?
If the specific output is high enough, you can get the material between the cylinder on the 3/5 and 4/6 to make it fail. Also, the valve job doesn't last as long on those cylinders, just from the heat.
I've tried a lot but never found any power. Never really saw a difference in anything else either. We had a few other things to try, but I quit.
