Hmmm. I completely agree that the bottom half of the order was terrible last night, but the Sox still scored 7 runs. It would appear that Farrell's changes to the lineup have now paid off for 3 straight games.
But your comment about leaving Pomeranz and Hembree in too long makes no sense at all. Almost all the damage to Pomeranz was done in the first inning, but he finally got out of it with just 5 runs. There are very, very few MLB managers who will take out a starter in the first inning for less than 7 runs. As it turned out, Pomeranz went 3 more innings and gave up 1 more run, and the Sox got it back to 6-4 when Farrell pinch hit for Pomeranz in the 5th--in my judgment, exactly the right move.
As for Hembree, he went into that game with an ERA below 2. Plus we were just in the 6th inning. Farrell had every reason to expect one inning from Hembree and lots of reasons to hesitate replacing him. Plus he only threw 13 pitches as it was. Had it been late innings and the Sox ahead, then pulling him quickly might have made sense.