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Marcos,
It definitely sounds like you are cutting your pins too long. We've all been there! I wouldn't waste money on a two ounce hammer just yet. I have an 8 and a 2. I use the 8. It feels...

Sounds to me like you cut your pins a little long. If there's too much sticking up, they will kind of mushroom over, instead of peening fully. A picture or five, or better yet a video, would help...