Ok guys, I've been fiddling a bit with my back pieces to try and get some proper alignment and I think I've made a major improvement on it!
A fellow trooper suggested that I could use some duct tape to align the back, kidney and butt plates and check if that helped in any way make the whole thing look in place. Indeed it did! Aligning al the back pieces helped make their relative positions correct and properly aligned. In fact, the back plate came up to its place (it sits very comfortably on my back) and the butt place improved its placement very much.
Here is a picture of the duct tape inside the armor:
Now on to see how this fits on my body:
Front looks just as it did before to me, no major issues to adress here (at least for now)
The back shows a significant improvement: pieces properly aligned, no overlapping the kidney plate, back sitting higher on my back and butt plate sitting lower.
The left side view looks WAY better, but here comes the biggest Issue I can see right now: Since I'm 183cm (6ft) tall, the whole thing is a little short for my height which causes half my butt and half my crotch to stick out below the crotch area and the butt plate (you can see it in this picture clearly). ¿Any tips on how to adress this issue?
The right side also looks better, need to make sure the kidney and ab plates line up properly and use non-elastic webbing to keep them in place.
So I think I am going to get some white duct tape and duct tape the hell out of the back armor plates to make sure they are always perfectly aligned, plus once the duct tape is in place, set all of the straps to the exact length in order to help the whole thing stay in place and not let the duct tape be the only thing holding everything together!
What do you guys think?