More small caves lower in the world to add interconectivity

So something I noticed while flying around in spectator is the fact that as you get deeper in the world the old caves seem to phase out. I propose keeping the old style caves mixed in to the new caves at the lower levels. This will achieve that once you fully explore a noise cave you can explore some old style caves and hopefully have them intersect with a different noise cave for you to explore.

P.S. More noise caves would be cool, both cheese and spaghetti caves to prevent having a bland experience spending half your time in old caves. Also with only bringing the old cave rates from above there would probably be a decent chance you don't find a noise cave so, noise rates would need to be buffed.