kanewolf :
If you have Windows and drag and drop or Ctrl-C, Ctrl-V then you are using the Windows file sharing protocol known as SMB. The Linux version of SMB is SAMBA. The router runs a Linux based O/S and uses the SAMBA package to implement the SMB file sharing protocol. FTP is a different protocol. It is a "get" and "put" protocol. You can't typically open a word document via FTP. You can with SMB.
You can use something like filezilla (I don't know why the one poster in that thread said not to). it is not as convenient as SMB for a Windows machine.
I have now used the FTP Protocol. and Getting 30MB/s wLan off my NTFS SSD connected via USB 3.0 at 5GHZ with channel and channel width at Auto. And well I guess that is alright. Quite disspointed but fine I guess.
Now it is just the question of what to pair with a NAS if ever 30MB/s is the MAX for USB attached to router.
a) Keeping the WRT 1900ACS and continue tinkering with DDWRT
b) Exchange the WRT 1900ACS for a TP-Link AC5400 TriBand w/Mu-MiMo since its only $20 more
c) Will a NAS connected to the LAN port make much of a dramatic increase? should i test it first with ethernet attached computer then transfer files over windows sharing network