75% of my cooling problems were solved with the oil cooler change I did but still needed more margin for hot weather climbs.   Made the decision to not change or enlarge the cooling outlet (that adds drag)  so went ahead and butchered the pretty inlets I made. 
Ed Anderson's spreadsheet on BTUs & CFM cooling air required was instrumental in deciding to go this way.   It showed that without negative pressure on the back side of the rads, there would never be enough cfm to do the job during climb at full throttle.  Negative pressure is what I had when I flew without the cowl on but oh what a draggy condition that was.

The old inlets were 4.5" diameter for the radiator and 4.125" diameter for oil cooler.
New inlets are        5.190" for the rad,  and   4.875" dia for the oil.

This may not sound like a lot but it represents a 36% increase in inlet area.

Results were excellent.  Oil temp went down 19 degrees at the test speed (130) and water temp dropped 9 degrees.  On 80 degree day and 500 ft msl the oil temp maxed out at 194F at 210 mph which is way faster than I would normally go at this altitude.  Temp was around 175 at 130.    Oil Temp in climb remained below redline (210) but the temperature lapse rate today made results not very meaningful.  OAT was dropping 14 degrees a minute at 3000 fpm climb rate.

now back to that nasty composite work to pretty up the inlets again.  They look like large stubby pitot tubes now.

I hadn't thought of a good name for the RV-8 but a friend in California recently came up with the winning idea which fit it well. "Euphoriac"  It's a term from a  Sci Fi book (Vintage Season)  meaning something which induces euphoria.