A few errors in your pcb layout and I tried to use Layo program to rectify it but found it a little less user friendly than Circuitmaker program I normally use. So I have redrawn it using my program.
Just about to make a pcb so I will let you know how it goes.

Another thought along the lines of your designs, wondering how you log the best revs versus timing advance. One would imagine a manual advance where you could vary a pot setting to adjust delay time and then see how it affects the revs. Then plot the results?