And we have fire! Apparently, timing on the 1-4 cylinders was off. When I set it, I lined up with the advance mark while twisting the magnet forward, but what I did not do was check that the timing light lights up on F without me twisting the magnet. I could not get them both spot on, F is perfect now, T close enough, I suppose.
Thank you so much everyone for your help in figuring this one out.
Regarding the choke, the set screw is not engaging with the cam even when I've screwed the set bolt out to the max (anymore and it will fall out of the nut). I suppose I could simply swap the bolt for a longer one, but I wonder if I'm just tackling the symptom and not the problem. I don't think this was a problem before; is there any other adjustment I am missing that could impact distance from the set screw fitting and throttle cam?