I use extended display also for the clock, one possible method although Corey would need to confirm this is to save the default tourney with the gaming window already set-up on the extended display. Or make a new default tourney with your preferred seats, blinds & chips etc then save this as (eg) mydefaulttourney and then under preferences tab, config files, default tournament, select this tourney to load automatically each time you load TD.
Regards
Stuart