I'm not brave enough to shoot trap with 3/4 ounce loads, but low velocity one ounce loads absolutely smoke the targets if I center the bird in the pattern and are reasonably pleasant to shoot out of a 8.3 pound BT-99 trap gun.
The more I study the shot ballistics charts on pages 104-105 in my Lyman Shotshell Reloading Handbook, 5th edition, the more sense it makes to keep the muzzle velocities subsonic. The difference between the 40 yard velocity of 7 1/2 shot with a mv of 1330 and 1135 fps is only 65 fps (715 vs 650 fps), and at 60 yards, the difference is only 40 fps, (580 vs 540 fps).
OK, maybe the extra mv makes the lead less tricky, so I compared time of flights between these two velocities to go 40 yards, .129 vs .145 seconds. A difference of .016 seconds or enough time for a clay bird traveling 40 mph to travel 11 additional inches.
That may be the main reason that international trap loads shoot their 24 grams of shot at such high velocities, it's certainly not because a 1145 fps load wont break the birds.
As for me, I think I can learn to shoot 8.5 ft in front of a 40 yard bird instead of only 7.5 ft.
This of course assumes that the bird is still going 40 mph after it's 40 yards away, which it most likely is not.