Ooookay, here she comes...
You need the
S3D - Silent 3ditor from
skwasjer to change anything:
The Fubuki.sim is in /playable DD Fubuki.../Data/submarine/NDD_Fubuki/
I changes the Mass of the Ship from 1680 -> 1730, this prevent the to long lasting Dive in High Waves. (i try the Mass of 500, she sinks like a Stone

)
GC height from 2,8 -> 3,8, to let her more roll
fr ratio from 0,5 -> 0,4, prevent that the Stern ist to long under the Water
Drag:
LR: 0,25
UD: 0,05
Thats for the better Movement in the Waves.
Make a copy of the Fubuki.sim and rename it to Fubuki_old.sim bevor you change anything (its really better

)
After every Change you must deactivate and activate the Fubuki Mod in JSGME, otherwise you see no Change.
Thanks to Xantrokoles for these fine Ship.
Video on Youtube:
its not final, but much more better than before. I think i can lower the Mass a little bit...
Edit: Now:
Mass 1720
fr ratio 0,43
UD 0,04
LR 0,27
At High Waves be carefully with Max Speed, this causes green Water on Deck (i dived 10m, but i could save her and our Lives

). Thats o.k., during my Navy Time at a german FPB we had the same Problem in the Bay of Biscay, at 18Knots.
Similar High Rudder during Max Speed, only 10° was allowed at the FPB. You can try more, but without warranty of the Shipyards.
See also
http://en.wikipedia.org/wiki/Tomozuru_Incident
Last Changes:
Mass 1721
fr ratio 0,41
UD 0,03
LR 0,35
gc Height 3,5
Now its o.k. i think.