Files doubled up

I seem to be getting some of my files doubled up when i view them on my TV

What model is your TV?  Not all DLNA devices behave ‘properly’…

Have you looked into configuring the Twonky media server (that’s what is letting your TV access media files).  It sometimes gets confused with media lists.  You might look at this thread for some tips on getting Twonky working reliably:

http://community.wd.com/t5/WD-My-Cloud/FAQ-Twonky-DLNA-Media-Server-Setup-amp-Use/td-p/858810

or it would buffer constantly on my phone.

Remote access to media on your MyCloud needs a good uplink rate on your broadband connection to be able to stream media out to the internet, and down to your phone.  Depending on the image quality, you are likely to need 3-4Mbps uplink rate to view video without buffering issues.  Even uncompressed audio requires 1440kbps.  You’ll also need this as a download rate on your phone.