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A piston stop doesn't mean you've found TDC, it's for setting your degree wheel. If you want to find TDC, use a coat hanger and rotate the crank by hand until it's all the way up or buy a bore scope you can use with your cell phone and watch the piston reach TDC. Then compare zero on your balancer to your pointer.
Timing marks on a damper don't allways match a timing tab. Set your timing where your engine & vehicle/ fuel combination runs & starts best. Keep the timing less than pre-ignition or detonation, (commonly called "valve rattle sound") and you should achieve decent performance and mileage from your combination. If your timing marks have been verified against the internal part rotations they are an excelent reference to begin fine tuning your specific set-up. My 16 degree BTDC current setup may or may not work on another vehicle.
Is this a stock cam? Are you running premium fuel?
Run high quality ignition components. Get OE or better. When you buy a new cap and rotors, it will come with a new carbon button.