Skipped this time, fearing deal overkill.
I recommend the route of sending in a shirt. Just measuring does not necessarily capture the slope of your shoulders and when your shirt's bespoke you'll save yourself a few iterations.
Send in just one shirt and specify which cuffs and collar you want, if necessary via image. Luxire has done all of them before
I recommend their prepaid express shipping:
Send in your shirt if you can be without one for 4-6 weeks. They will copy it exactly. Without a doubt, the easiest and best way to dial in your measurements.
You just can't get too caught up in "Perfection." You have to recognize that MTM is going to be the best fitting shirt you wear, but don't obsess over little details. No one will notice a quarter-inch here and there, or that the shoulder slope isn't perfect, except for you.
...At least, that's what I repeatedly tell myself.