Make Mobs Spawn More at y128

The Mob Spawning Currently on Java Edition is conditioned so mobs spawn more at the bottom of the world. Earlier in 2021, there was an experimental snapshot that changed mob spawning to be the exact same rates as at y -64 and at y 320. This change made a lot of farms slower and couldn't become faster. Rather now mobs spawn super fast at y -64 and super slow at y 320. Changing the Fastest spawn area to y 128 will make mob farms fairer to have a higher speed while not clearing out a giant area. -Note this would be for the overworld only, for the nether it would either stay the same as currently or be half of the useable space there as well.