Improved Common $t\bar{t}$ Monte-Carlo Settings for ATLAS and CMS

The ATLAS and CMS Collaborations both use POWHEG+PYTHIA8 for their nominal $t\bar{t}$ Monte-Carlo simulations. Presented here is a second iteration of agreed-upon common settings for such a setup, in order to ease comparison and combination of ATLAS and CMS results. Validation of each experiment's ability to reproduce identical samples is shown, and subsequent comparisons are made to publicly available unfolded data. An additional common setup, using the SHERPA Monte-Carlo generation package, is similarly validated and compared.