Hi
Whats the bitrate your using for Apple Loseless 160Kbps? or? LoseLess (meaning you lose no data upon Compression/Decompression). I've heard from a guy who works in Post Production for a major Studio that anything less than 160 isn't that good, he uses AAC and WAV both at 320 and he's also an Audiophile.
Have you also tried AAC at 320 the other codecs offered by apple? MP3 at 320 Kbps, MP3 VBR, Audible (formats 2, 3, and 4) WAV, and AIFF?