Mirrors are tough for me to use because my eye is at a different angle. Photos allow for that "flat" look at the tiller. I use a camera with a timer on a tripod. Yes, it slow work taking a picture, downloading the image then going back to the shop to tiller. But, I feel when I get to the last couple inches it's time well spent.
The bow looks good, you should be able to hit you mark.
For "the what I would do" comments: 27" draw at 55" is going to start pinching your fingers with the string when you draw the bow. I'd flip the tips a little to reduce the angle for the string pinch. At this point ( some will disagree, and I welcome that so you know you have more options), I would heat in a little reflex and heat temper the belly. But, be prepared, your tiller is likely to change a little if you do this. BUT, I WOULD ADDRESS THE FLAT SPOTS BEFORE I DID THE REFLEX AND TEMPERING.