A huge thanks to lj50036
I just want to extend a HUGE thank you to lj50036 for bailing me out of an extremely deep hole I'd dug for myself. I managed to get my TF300T to a point where it would only boot to the bootloader menu and not respond to ADB or fastboot. He was able to get me from there, to having Kit Kat installed in about an hour or two.
I really can't thank him enough for helping me out.