The best advice that I can give is for you to put google to work. My personal LORs were good but just like many others I was lacking pilot LORs. Being prior service, a friend put me in contact with a CW4. I still wanted to find the evasive CW5. I googled all the AV units on Ft. Hood and tracked down their Facebook pages. I then wrote up a well written introduction for myself and messaged it to the Facebook page. I then asked the moderator to put me in contact with a Senior Warrant. A few hours later I received the email to a CW5. Then I just tweaked the introduction and added more content about myself and emailed him. A few days later he emailed me. Needless to say I am good now.
This process is almost designed for people to fail or to quit. You must be flexible and think outside the box.
Hopefully this helps. Good luck in the future.