Well this not acctually a question but rather a helpul tip for you guys out there trying to fix the speeds of your new 10Gbs network with Synology. I tried everything but never got over 2-3gbs (220/400 Mb/s).
But at last i found a little setting hidden for changing to SMB3. And viola! I now get speeds of write 400mb/s read 800mb/s. Where it should be regarding to my hardware.
So please see attached image where you can fix this setting.