While waiting for his reply regarding the sound chain he use. It is crystal clear to me if you have a need to remaster and eq your whole collection then you need better equipment to listen to the music it might give that sparkle you miss in the sound.
Or instead http://www.aphex.com/products/excited
Then you do not need to thru the the process to remaster at least.
I respectfully disagree with everything you said and you will be waiting a very long time to hear about my irrelevant, but super sexy signal chains. I had an Aphex exciter and traded it for a bag of weed before you knew what it was.
The Aural Exciter was more of an joke from my side.
Anyway you seem to speak mostly about volume and dynamic, instead of going thru and remaster all you should have some equipment that do this on the fly, there is a lot of signal processors that is audio level independent that adapt to the volume. Also there is replaygain not sure if itunes have it. And since you do not seem to have any respect for the source audio and you want to mangle and remix it so it please your ears you should make it thru some equipment with certain character you like and it will transform it to your liking, there is plenty of hardware out there that will make all sound great like true magic and with even volume.
Anyway I think we will not agree on this topic I would never do what you do and in the ambient world I am kind of anti-compression atleast on the master. I wish you good luck.