Lenny, I think you're on to something there. I made a temporary platform so that I could stand at Y=30. The spawn rate sill didn't seem as good as 1.2.9, but the endermen were continually spawning, trying to attack the endermite and falling in the trap. I also stood at y=29 for a couple of minutes and no endermen fell down. Interesting that the spawning behavior changes with my character position.
Lenny, I think you're on to something there. I made a temporary platform so that I could stand at Y=30. The spawn rate sill didn't seem as good as 1.2.9, but the endermen were continually spawning, trying to attack the endermite and falling in the trap. I also stood at y=29 for a couple of minutes and no endermen fell down. Interesting that the spawning behavior changes with my character position.