I live in the Netherlands and used this server: 50.235.23.218
[update]
Just tried also your server:

Just received an upgrade from 300 to 400 Mbps.
14 hops and established 413 Mbps!

I use 6.39.1 live on production (CCR1009-7G-1C, netmetal 5, hex poe, etc.), [...]

I'm using CCR1009-8G-1S-1S+ also with Winbox 3.11

Same problem here. Last weekend tried to upgrade my CCR1009 from 6.38.5 to 6.39.1 It was a disaster. Luckily i could connect it anyway over my VPN and did a downgrade to 6.38.5 and reinstalled dude-server. Working fine now. This morning tried to upgrade wAP from 6.38.5 to 6.39.1 and that's totally b...

Works also perfectly from the Netherlands.
Got my full 200 Mb Down and 20 Mb Up!