And a quote from John Mullins, 1st FG P38 pilot and author of the 1st FG History.
He is talking about the J-25 which is essentially the same plane as the P38L. This wouldn't be the J we're getting but speaks to the differences between the Early model 38s through the J-20 and the later J-25 and L models.
"In the latter part of the summer the P38J-25 began to appear at Salsola. This modification of the J series represented the greatest change yet from the pilot's point of view. The two major differences were the addition of the hydraulic aileron boosters and the placement of dive brakes under each wing. The aileron boost made an amazing difference. It was similar to what we now call power steering on automobiles and improved the control sensitivity of the P38 enormously. During the first take offs in the J-25s the ship litterally fluttered as it left the ground due to the pilot overcontrolling despite his best efforts not to do so."
And a follow up quote from Mullins:
"The dive brake modification was designed and actually approved early in 1943. By the time the brakes were installed in the J models over half of all P38s had been constructed. So goes bureaucracy, even in wartime."
Sounds a tad bitter that old 38 driver

He started in F models and finished in an L model while flying with the 94th FS, 1st FG.
Dan/Slack
Can't wait for that G