Default Mount /system rw using terminal.

I have been trying for hours now to remount the /system partition rw using terminal emulator with no luck. I can do it just fine using root explorer, but thats not what im after. Im trying to make it so that system is mounted rw on boot. But every command i have known to work in the past, and every one i found thru googling has not worked. The command finishes with no errors, but /system is still ro. I even went as far as to unpack the boot img and change /system to be rw on mount. But again when i boot up /system is still ro. Its like something is protecting it or remounting it ro again. By editing the boot.img i was able to mount the root directory (/) rw on boot, but doing the same edit to the /system mount point seems to have no effect. Anyone know what im missing here? I am s-off, unlocked, i have an insecure boot.img, i have root, i dont know how much more insecure my phone could be. If root explorer and other apps are able to do it, there has to be a way to do it thru a shell.
Sent From My HTC One (M7WLV) S-OFF Rooted
Hboot: 1.56.0000 (Unlocked)
Recovery: TWRP 2.6.3.4
Baseband: 1.13.41.0109_2
Kernel: ElementalX 13.5
PRL: 15287
Rom: Stock OTA 3.11.605.1

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