Thanks for the replies, all. @gmrhodes13, I guess I wasn't super clear with my image. I was wondering which leg looked better in terms of the gap, the left or the right. After fiddling around with it a bit, I think I'm going to go with the smaller gap. This also helps out with walking, as it lifts up the thighs so that I can bend my knee a bit more. I have a slight cutout on the backs of the thighs, but I'm wondering if I can do more for ease of movement. I don't have a picture handy, but I'll get one in the next few days.
@justjoseph63, thanks for the heads up on the buttons. Luckily it's all E-6000'd on. I'll pop it off and sand it flush. Also a good point about the upper thigh return edges. Those aren't required? If not, I'll definitely be taking those off to ease movement and fit (thick thighs here lol).
And @Allan1313, I have seen people do the hot water bath on the backplate to help eek out an extra cm or two. I'll have to give that a shot.
Also another general question: would it be okay to trim the neck return edge a bit in towards the corners, so that it blends evenly into the shoulder straps? I get a bit of neck bite from these two corners. See the pic below for illustration.
Thank you to everyone who has replied thus far. It's really helpful! I'll update later with some more pics as we go.
Also, how do I attach more than just a teeny-tiny image?! This is driving me bonkers. I had to compress this one to smaller than 30kb in order to attach it to this post. What am I not seeing here?