One of the rules of thumb is to make your cuts no more than 1/4" at a time. Once you have gotten the feel for your router and its operation you can alter this based on performance. The reason you ended up with the "tab" on the outside is your material was no longer secured to anything. You can place double sided carpet tape underneath your rings to help hold them in place. Depending on the application you may be able to screw through the ring to hold it in place, this is more secure. To help reduce tear out you can raise your round over bit slightly for the first cut and then you will just be making a fine finish cut on the second pass.
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Mike
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