In yesterday's game, you could see an obvious difference in his hitting mechanics with the new, more closed stance, and if you check out the replay of his homerun swing against Burnett, i think it is not humanly possible for him to be any more in sync than he is during that swing.
Another thing to note, is that it's typical for left-handers like himself to find consistency with their mechanics early in their careers, an example to note is Robinson Cano who also had a very "moving-parts" swing and could be easily overpowered by the hard stuff high and inside until he he adopted the new stance and shortened his stride, allowing him to keep his hands inside high and tight or tight and low hard stuff, as evidenced by his shot against Beckett yesterday,and this seems to be exactly what Jacoby is shooting for.
He ranks among the league leaders in PPA, he's swinging at strikes consistently, and he's not striking out much, so i fail to see your point.
Agreed, but he's definitely not sucking now, although he could stand to not always go for the hit when ahead in the count, the improvement is showing, a little bit more in the OBP department would really be all he's lacking to go from "solid" to "very good".