ok confirmed: clockworkmod recovery for the evo 3d does not work on our phone. It just reboots you back into android. However, clockworkmod *touch* recovery for the evo 3d does for our phone. I am currently testing its functionality first by backing up (of course). So far so good... I'll try mounting usb next.
edit: however, I did get the following
E:Bad boot message
not sure what that means..
edit: mount usb does not work, "E:Unable to open ums file (no such file or directory)" or something along those lines.. (typed that after reboot). I'm gonna stick with TWRP for now.