New setup and still have buzz

Yeah I just got my les paul back from a minor headstock repair and got it all setup with a new pair of flatwounds. I went from .009 to these heavy .011 flatwounds and Im getting some buzz around the 12th fret. Since I just got it setup, Im wondering if the change in gauge was so much that the neck is adjusting to the tension. Is it my pick attack. Sometimes I have an aggressive attack. Should I raise my bridge or adjust the truss rod???


...Or should I just tone down my attack???

Did you pay for a setup? If you did I would bring it back. If all they did is repair the headstock and put on higher gauge strings you shouldnt have a buzz if you didnt have one before.

Their was some buzzing going on before the repair, the guy said he would take care of it...

Cool.

How are flatwounds on a guitar? I thought they were usually just for bass?

Flatwounds have a very nice feel to them, I thought the mellowness of them would give me a nice jazz tone from my valve marshall combo. Which it does, but I still like the bite I get from round-wounds. Once these flats are on their way out, I'll probably go back to round-wounds.

I got DAdarrio Chromes .011-.050

Does anybody have halfwounds???