Your dress is beautiful, I was expecting something really bad from your previous posts. You need to find someone to practice on the corset, because it requires some skills to get the hourglass shape and beautiful lace-up at the back.
As for the measurements, it is always better to find a tailor to take them instead of doing it yourself. I wear custom made suits, because of my sub-zero size and the fact that I refused to wear pants that make me look as if I am wearing diapers. The measurement taken by my suits' tailor is always 0.5 to 1.5 inch different than what I got when I measure myself, and of course I gave the tailor ones to Monica Bridal to make my dress.
My dress has zipper, because I want to try it on all the time, and I know I can't do that with a corset lace-up dress. My challenge is actually not to lose weight which I usually do when I am under stress, from 95 lbs to 85-90lbs. Of course I already got plan B, I bought a microfiber corset with ultra push up cups and a roll of fashion tape, so in case of any weight loss, I will wear the corset and tape the dress on it!
Almost like the original at fraction of the cost!
The dress is much nicer without the strap, and it looks amazing on you.