I have updated original island: Overhauled cave systems, they now look majestic and smooth.
updated stronghold, it now looks more strongholdy and less like a military base.
these changes are only on the jungle island, so you can copy/paste rest of the chunks from updated link.
I have an idea for the chests. If I put an item in each chest, it'll show up on the xml file with location, then you can just replace that with the original xml, if that makes sense.
the chunks you moved are perfectly aligned, now you can start pasting my updated jungle island!