I have about 20 hours on the 180 HP RV-9 floatplane and have an issue with high cylinder temps. Rear cyls go to 440 on climb out. Fronts are fine. Have experimented with dams but no change. Changed to -41 carb which helped a bit, but not enough. Baffling is very good and it was always fine on wheels, but with slower speeds in all configurations on floats temps are a bit too high. OATs in Anchorage are generally cool, 70 or so. anyone have any ideas? Am thinking of louvers on each side of bottom cowl, maybe opening bottom a little more. I now have to level off and reduce the power to get temps down 75% level cruise and rears go to 415. Help.