I noticed you used the Victoria 2 provinces as a base. As such there were some fairly large errors, and some smaller ones, which I corrected. I expect everyone will have made corrections by the end of it, unless you wanted to alter the borders to fit a more 'real' look.
In any case, I recommend the below:
I made 6 edits.
1. I first edited Occitania north, south and west. I made all edits to be truer to the original map, for example, the hump of north Occitania was almost completely missing (and where it was before it trespassed on Confederate territory), so I manually changed the borders (out of the Vicky grid) to suite it more adequately. Same rule applied to the other sections. I could go in detail, but I think they look appropriate by simple inspection.
2. I changed the Brittany border a little bit, in particular, I gave them more territory to the south, which according to the old map, they should be the owners of. I basically gave them the province directly to their south.
3. I gave the Netherlands two provinces in the south from Franco-Bur., to smooth out the border, I think they agreeably make the Dutch border more accurate to the smooth slope in the old map.
4. In the old map, (except where the Rhine reaches the Netherlands) there is not an inch of Rhine river docking German territory. I thus pushed the Confederate border into German territory slightly where this was not accurate.
5. I think Cechy-Morava is waaay too big. I removed all their most northern provinces to demonstrate this. In fact, in the old map, there is a dip in the far right of their northern border which exactly corresponds to the dip in the Vicky grid if you take these three provinces away. I think this is clear proof the border should be pulled back.
6. The White Sea island is Russian. (far top right corner)