Since May 27th
wRC+ 163 (#1 in MLB)
Pull% 42.8 (#5 in MLB)
Oppo% 22.9% (#23 in MLB)
GB% 43.4 (#14 in MLB)
Hard hit% 36.7 (#3 in MLB)
babip .359 (#1 in MLB)
So they have been pulling the ball more, going oppo less, and hitting the ball on the ground a bit less.
They are hitting the ball even harder, relatively speaking.
HR/FB (16.7%) is 4th in MLB in that span whereas before it was 10th in MLB (11.7%).
Still hitting grounders too much IMO and probably getting a bit lucky during this stretch with BABIP.
Conclusions:
1. Pulling dat ball is working at turning some of the flyball outs into dingers
2. Keep mashing - try to murder the baseball almost all the time
3. The offense could be even better if we could get Vlad to stop hitting groundballs
Since May 27th the only hitters with groundball problems are Vlad (54.7%) and Springer (54%). I am not concerned about Springer there because that's way above his career mark and it's a small sample, but maybe he is a bit tired and cold use a few off days... Springer also has the highest pull% on the team since May 27th which might be why you haven't noticed the groundballs as a bad thing; he has been pulling hard grounders for hits and doubles often enough. You really notice groundball issues when guys are hitting into double plays up the middle like Vlad always does.
Kirk and his 248 wRC+ in that stretch has the lowest GB% on the team. He also has a good pull% since May 27th at 44.2% and four pulled homeruns.
It is safe to say that the difference between Kirk as a good hitter and Kirk as a great hitter is probably as simple as him figuring out when to get sluggy and pull a ball in the air with authority. I mean he can poke things up the middle and the other way in his sleep but that doesn't get chicks.