In my opinion, and the stiffness of the top would have a lot to do with it, the braces are bigger than they need to be. If it were me, based on my limited experience, I would taper them more gently from the bridge position rather than having such sudden shape changes. I would also vary the heights down from the center to the outside. Say 6mm in the center, the next ones at 5 or 5.5, then down to 4 or 4.5 then down to 3.5 or 4 mm on the outside fans. Here is what mine looked like, and I know we are talking different designs here, so we're comparing apples to oranges a bit, but.....
This top is about 2.1 to 2.2mm in the center and somewhere in the 1.5 to 1.6mm range around the edges of the lower bout. The braces are, center 4 x 6.5mm, 3.5 x 5.5mm, 3mm x 5mm, and 3 x 4mm. I tried to taper them more in a soft bell shape with a bit of flair at each end, though I tapered more gradually toward the tail than toward the sound hole.Attachment: P1010536 (Large).JPG
On my first, the top was 2.4 to 2.5 in the center, and more like 1.7 to 1.9 around the perimeter of the lower bout. The braces went from 3mm x 5.5mm center, progressively, down to 4mm high on the outside fans. Both tops were German Spruce bought at the same time. Nice and stiff, but probably AAA tops from Uncle Bob.Attachment: P1000380.JPG
These are just examples. Not trying to tell you what you did is wrong, but I believe it'll be a little over braced with the present plan. Is it to be a standard classical, or a flamenco? I notice that there are no closing braces at the tail. Maybe your plan doesn't call for them.
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