Ok, I'm not exactly sure how the internal file system is set up as I've yet to receive my M8 but if it's anything like the previous android file systems (which I'm guessing is the case), you can use a file explorer (root explorer, ES explorer, Astro explorer) to navigate to /system/app. You may have to switch R/O to R/W within the file explorer depending on which file explorer you choose to make changes to the internal card. Within the /system/app folder, you'll see all the system apks. BE VERY CAREFUL to NOT delete things you are not absolutely positively sure about. Deleting the wrong app may render your device useless so do be careful. If you do not see the bloat apks you're looking for, navigate back to the internal root directory and search for /data/app. Here is where the other apks should be stored. Perhaps the file system is a little different but i've used 4.4.2 on several different phones and it has been the same structure.