[IMT]

Ive tried many 1/2"ers and i always have bad chatter almost no matter what settings.

I've had the same experience with 1/2" end mills on my 1100. 3/8, 3/4, 17mm and 25mm insert tools I can push up to the power limit but not 1/2". I've tried Niagura, OSG, Atrax, Lakeshore and have not been able to get a decent MMR before it chatters, so I only use 1/2" for light finish passes, if I can't get a 3/8 to reach. All the ones I've tried were 30 degree helix, general purpose. I ordered some high helix 1/2" endmills and I'll see if the results are different.