Windows ftp client supporting multithreaded remote to remote transfer

Windows ftp client supporting multithreaded remote to remote transfer

I have a large amount of data (3.5TB) that I need to transfer between two
FTP servers. I am not looking for an FXP solution; I understand that I am
looking for an FTP client that will handle downstream to local temp
storage and subsequent upload to destination. The origin FTP I am grabbing
files from limits single connection to 1MBps but allows concurrent
connection without limit. I have a gigabit connection available on the
local windows machine handling the transfer and need multithreaded
downloads (not multipart).
I'm a Linux/Mac developer and I can't think of a client that does what I
need and I have tried filezilla(no remote to remote transfer), smartftp(no
non fxp remote-remote transfer), flashfxp(no multithreading), cuteftp(no
multithreading only multipart). Cyberduck will do what I need, but to
allow multithreading I have to place files individually into the queue,
with thousands of files to transfer I estimate it will take me 30 hours
just to do this.
TL;DR I need a windows FTP client that has a feature set including
Multithreaded downloads for individual files that are queued.
Remote to remote download with temp local storage buffer.