It is a big single, it is always going to vibrate some.I was hoping for some engine vibration reduction, but it seems unchanged. However, no change makes sense if the OEM spring was intact and functioning properly, me thinks.
But I will ask, Is your drive chain TOO Tight? If so, it will cause excessive vibrations. Needs to be loose enough to lift the bottom run up to just touch the rear tip of the rubber underslider.
Are some of your engine mounts Not Tight Enough? If so, they will allow more vibrations to be felt.