Okay, so here's the process I had (yuma, I'm afraid I didn't PM the mods anything at the time to explain my shots):
D1: I said I wasn't going to shoot anybody. HOWEVER, we didn't all agree to that, and (this is key) we D1 lynched the SK. This, in particular, really changed my mind (but I'm glad I claimed not-going-to-shoot because it threw me off the vig-hunting that could have happened).
N1: I wasn't sure who the Mafia were, not having a ton of reads on anybody, and I -really- felt like the best thing I could do was be 100% sure that ashersky was really a 1-shot doctor (no offense, ash, but if anybody was going to fakeclaim 1-shot doc it would be you!) and in the process give the rest of Town a better idea of setup - something that would end up key to Town D3 play, as the N1 and N2 shots confirmed we had a full vigilante without any need to claim.
D2: Theorel almost immediately jumped out for EVERYBODY, and got lynched. In the process, TA sounded somewhat insincere and tripped a little bell in my head. I was actually most worried by that shot - was I unintentionally shooting the doctor who was hoping to be obv-mislynch enough that Mafia wouldn't shoot him? I actually didn't recognize yuma as doctor and was surprised at the flip later.
N2: As stated, TA felt scummy to me after D2, so I felt it was worthwhile to risk shooting the doc - and luckily I was right and he wasn't just intentionally playing scummy. This really got me excited, honestly, more than the D3 shot even, because it was my weakest shot.
D3: The no-lynch plan was awesome, and the quick "scum to chum" that everybody wrote up sealed the deal. I knew for sure after reading those that it was either mail-mi or nkirbit (or I was -really- being well-played by Voltaire or Xerxes), and after reading just the scum to chum a few times, I decided mail-mi would be N3's shot and nkirbit would be N4.
N3: As stated, going into N3 I'd already picked N3/N4 vig targets. I think if we'd gone to D4 we'd quickhammer a no-lynch.