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@Oswald
5-6mm is way to high .. I guess I don't need to tell you but it should be about 1-2mm. The CX70 isn't going to sort that issue for you I'm afraid because it will mount roughly in the same place. You need to get the mech lower .. or go up slightly on your tooth count.
Another couple of ideas ..
1 - take a round file to the bottom of the braze on and remove a small amount of metal .. go slow and trial fit mech between files. I don't think this will get you 3mm!
2 - file some material off the mech mount bolt only where it goes through the braze on of the frame so it can sit lower. You'll have to measure carefully the position and reduce the dia all around so as it tightens it doesn't move back up. Again I don't think it will get you 3mm but a combination of the two may be enough?
3 - not sure if this will work .. but Sram have two mounting points in the front mech so the 'upper' point may allow the mech to drop low enough. If you can find a lender mech before you buy it would be best