Mike,
Dennis is right, you need to be as close to the power curve as you can get to realize the full HP pf the engine. You are, however, much better off than you were before you repitched. 6200 to 6300 should be your static rpm with your aircraft. This varies a little with each machine. High drag airplanes like powered parachutes can often run close to full RPM in static tests whereas high speed, low drag aircraft may run much lower static RPMs. Use Dennis' advice and pitch the prop to give you the maximum recommended continuous RPM during climbout.
Two cycles are extremely susceptible to weather so dont be surprised if your RPMs change as much as 100RPM with weather changes.
Don't know how you are pitching the prop but a good trick I use is to cut a notch in the end of a board which will fit the blade close to the root. This will give you the leverage to twist the blade in very small increments when adjusting.
Back to the radiators. If all this still does not lower the temps, you might try to find some thicker rads if you have no room for larger ones. Another solution might be to use a waterless coolant which gives you more cooling efficiency.
Bill.
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