Another huge advantage for the USAF is a cut in overall pilot numbers used in operational training roles at a time when retention is an issue. Many of the contractor pilots - particularly in hands on leadership roles - are ex-USAF FWC or USN Top Gun instructors and that helps with both continuity and ethos.
Surely that is part of the probem, not the answer to it..... retention is difficult because these contractors will employ ex USAF pilots no doubt on a decent wage without the crud that comes with service life, long detachments away from home, operational service etc, to the detriment of a service desperate to hang onto these highly qualified and skilled individuals..