One thing you might want to try is a method I read about in one of LEE Valley's historic reprints, originally published years ago, not sure how many years, but lots.
In this book they advise saw the lines for the tails first, no big deal there, then BEFORE you chop out the waste, carefully align the tail board with the pin board oriented the way it would be when put together. Then saw down through the established kerfs with your saw and establish the lines for your pin board that way.
I tried it on some scrap and it seemed promising, then I tried again only instead of using the dovetail saw I used a very fine kerfed saw and they did not line up so well. If your experimenting anyway try that.
Craftsmanship is the skill employed in making a thing properly, and a good craftsman is one who has complete mastery over his tools and material, and who uses them with skill and honesty.
N. W. Kay