I only had temp problems in my K if I pulled back the power during climb out. Mine was a 231 LB with merlyn wastegate no intercooler. Take off was cowl flaps full open, full throttle (39-40 inches MP) max rpm. Left it the same for the climb. Climbing 700-1000 fpm usually kept CHT's in check. On hot days I did have to lower the nose and climb at 500 fpm to keep CHT's below 380. Between 380 and 390 were my max CHT's for all stages of flight. It did seem that I needed to constantly adjust the throttle in all phases of flight to keep the settings I wanted. That plane never was set it and forget it. In cruise it seemed like the higher the MP the cooler the engine ran so I would regularly cruise with 32-34 inches MP, 2500 rpm LOP (9.5 to 10.5 GPH). TIT in cruise was usually between 1580 and 1620. Cowl flaps were always closed during cruise below 16000 feet, in trail when above 16,000. The picture below were my settings at 15500 with cowl flaps closed.