That's nice. I suggest you use 7-zip to pack the file. I compressed a ~200 mb file down to 8 mb with it. What you need is to use the ultra level and put the dictionary to 48 mb or bigger (but you'll need a good computer with lots of RAM memory). Here I couldn't even move the mouse while compressing (only 384 mb of ram).
Btw, good news, I found 2 new glacier firmwares and one of them is 9.1.5.1
. I'll make those available as soon as I can.