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It is best to use a ball bearing guide to trim the outer edges of the Formica. Try raising your bit up higher so that only about 3/16 of the cutting edge is left exposed below the surface of the bottom plate of the router. Many times when novices try to do this and they only have one router and it happens to be a very large one it has a tendency to tip a little too much creating the gouge you are speaking of. I have small routers to do just this process they are dedicated to this function. If you are going to be doing a lot of this work take a look at Harbor freight they are selling a router that is dedicated to trimming Formica. I think it only costs about $35 well worth the investment. It even comes with a cutter. If you are using a fence to accomplish this all is lost. Also the bits that do not have bearings on them are worthless for this application.
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