Well, good for you. Truly.
I heard a major difference between the v2 tweetage and the v4. It could be that you are not feeding much power through them and hence can't hear the difference. Frankly, I was shocked at the difference I heard between my M80v2 and the LFR1100 v4...from a tweetage perspective.
Now could the difference be attributed to the $10K-worth of pre/pro and external amplification? Maybe but I doubt it. We'll find out when the same external amplification makes it over to my place so I can try it with my M80s.