Cannot downgrade to KitKat

Hello, I have a Nexus 7 2013 and I love it. One of the main reasons I got this tablet is because it is a flagship Google device and it could run custom ROMs well. I want to throw Kali Pwn pad on it. When I flashed Kali, it looked like it flash successfully, but when it started it would just hang on the Google screen. Since KitKat was the latest edition of KitKat when pwnpad was launched, I decided I should try to flash stock KitKat and see what happens, it appeared like it flashed right, but when my tablet started it would still hang on the Google logo. I also tried to flash CM 11, and still the same thing happened. Every ROM I flash that is based on 4.4 hangs on the Google logo. The farthest I am able to downgrade is Android 5.0.0. My tablet came with 5.0.1 out of the box. I am currently running CM 12.1-20150814 Nightly. Another note, the only recovery I can get working TWRP MultiRom, the other verisions of TWRP (along with CWM) cant mount anything. My goal here is to get either Pwnpad or Nethunter (Nethunter would just hang on the Nexus animation, but I don't think I had enough patience that evening to let it run) installed.

Thank you for your help