10K - 12K is a little sweet spot when fighting against a KI. In a typical lower alt MA fight, I would suggest getting the KI to expect the 38 will be keeping it fast and then surprise him by dumping to flap speed and getting the nose around. If the KI isn't dead or hurt quickly, extend before the fight gets down to the KIs flap speed. This applies to many fast birds that don't turn as well but can get flaps out before the KI can.