You're spot on.
4-2-4
vs Parma = 4-0
Against Parma, the 4-2-4 gave two goals but when Conte made Vucinic the lone striker, Juve scored two VERY GOOD goals and pretty much playing very good football, dominating, owning, before the defense lose concentration and conceded late.
vs Siena = 1-0 (We could have score more)
I don't think so, it was a so so game, it's almost the same situation with Chievo. Hadn't it been because of Pepe's long ball, Juve would take only 1 point.
vs Bologna = 1-0 (Until Vucinic was red carded, Dp taken out at HT and we played with 1striker)
Against Bologna, again there's almost no clear chance when it was 4-2-4 (that goal was unconvincing) but then Matri played as single striker in the second half. Except for the stupid mistake from DC, Juve were dominating with that formation, bombarding the opponents even though they already lose 1 man.
= 9points out of 3games we grabbed while playing 4-2-4 (Except Bologna's 2nd half when we played with 1striker due to Vuci's red card)
Against Parma, the single striker formation scored two goals so the 3 points should be splitted.
4-5-1
vs Catania 1-1 (We all remember how weak we were and the hard time Catania gave us, check the match threads)
Matri simply couldn't handle the job as the single striker. This is the proof that the single striker performance hence its choice is very crucial. This is the first time Conte started with 4-1-4-1, with and Elia as starter and Vidal also starting as AM. Everything feels unconvincing and they still need time to adapt after starting every game with 4-2-4.
vs Milan 2-0 (It worked but still few questions mark over Bonera's gift)
Even if you take out the two goals, Juve were still dominating the match, the win are fully deserved.