Dura Ace track cog chainline question / right cog for Phil hub

^real world application of component combinations more useful that the search for the mythical perfect chainline; e.g. have you had your frame's dropout alignment checked?

Have a look at 0.5mm on a ruler, hold the ruler 41 cm away from you and ask whether you think it's going to make a blind bit of difference for a chain running from chainring to cog.

I know that real world measures are normally better, but in my case I am lucky that my frame's BB shell/dropout alignment is almost exactly spot-on, so I can actually go for these theoretical thoughts.
The thing is also that I do not know if any of the transmission database's bikes are spot-on or slightly off, so it's hard to judge if a setup will work for me as well.