I thought more about what Ginseng said and here is my thoughts:
In those first 3 days I was so intoxicated by the new sound I experienced above 4K that I reved the engine out quite a few times. This may have caused the initial break-in to include alot of vibration that led to a softer resulting rubber in the mounts. If I had babied it for a few days the initial break-in might have led to harder mounts.