In my experiences... The toms are either locked up w/hens after that time or they go into cover to get away from the sun + to feed... All depends on where you're hunting i guess... we're here in southern Ont. and the season opens in a week so we have a late season compared to many others but yeah.
Agreeing with Wingbone... sometimes it really pays to stick it out and wait.
The problem hunting birds throughout the day is that they become so much less vocal! Ahh that is so frustrating... i know this from experience! I think that it is a result of either toms being locked up w/hens or they just lose some of that morning fire! In any case persistence will bag a bird at some point... If you know where the birds are headed eg. dusting bowls/feeding areas.... Get there ahead of time and set up your dekes and do some calling... but don't over do it...
One thing i tried last year was to set up my strutter jake and a hen deke late afternoon close to a roosting area and do some quiet sporadic blind calling... a trio of toms came in putting on a show....
you'll learn the most from your own experiences... try to pattern the birds so you know where they go mid-morning... just a few thoughts...
Gerard