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I too am living the life of quiet awesome new diff. Quite a difference for my car but I'd wager no where near as big a difference as you're experiencing !
Those guys suck ... One dealing with them was plenty for me ... Admire your steadfastness with them !
I just replaced my diff and transfer case fluids. Transfer case fluid came out quite clean with no metal fragments. The part no. is different but I strongly suspect that it is the same as ZF Lifeguard 6 that is used in the trans. The smell, consistency and colour are all identical.
Front diff oil had a bit of metal in it - more than other diffs I've done - and about 2.5mm of metal paste formed on the magnetic drain plug for both diffs. This said they both still seem to be quiet.
Will do them again in 60K km and the transfer in another 100K km.