We've got the GSC 3-blade prop, set fairly coarse, but still allowing a 1500fpm climb. By heat issues, I can only assume over-cooling. The only time both CHT's are in the green is during the climb. During cruise, the temps are generally too low, with one CHT sitting into the yellow range. On a prolonged climb (>5000'), the oil might get up to 105, but that's about it. We've only just started to remove the tape that was reducing the airflow to the cooler. This is the same situation for the other XL on the field here.