Before the patch, 38s were able to outturn niks, spits occasionaly, la7s, 51s, hogs, etc. There were not too many that could out turn the 38 before the patch except the hurri and zeke but 38 could outrun those so wasnt much of an issue.
Now its hard to outturn 51s, hogs, la7s, niks, etc. to what I listed above. Because of the last flap the 38 is not able to turn as well as it once used to. When the patch first came out and got low and slow with a 51 and it out turned me I knew something was wrong. Landing on a cv I learned about the 5th notch flap as I sank.
P.S. Blooz, its also said McGuire had DTs on when fighting. He wanted the most kills in the war so figured he could quickly kill the enemy with his DTs then move on to have enough fuel to fight elsewhere and fly home.