Let me say right off the bat you should NOT have any vibration.. or to say very,very little..
You may want to make sure the router is in place right and tight in place.
Chuck up a 1/4" dowel pin and see if you have the same type of vibration if so pull the router out and check the collet and the bearings..if they are damage replace them..the router is made to spin very true..on dead center..if it's router router plate that is not right put in some small 1/8" x 3/4" dowel pins in the two corners to keep it from moving around,but don't screw it down with screws, you want to pop it out from time to time..
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