As far as I know we cant search by dates at baseball savant. But yeah, i had mentioned the increased a few posts above as well. It's definitely increased dramatically in the last month or so
A not so perfect system is using the fangraphs splits tool... in July, GB rate is down to 46% from over 53 in May /june, FB rate has increased from 22% in May to 35% in June, and again to 38% in July. It's messy, but it at least it seems to show a change in approach or mechanics.