well thats odd, coz have there pointed my r9 390/290 rigs and working... but some shares are taking up to 300-7000 ms also on the US server...
i just saw that the -allpools 1 is missing...
try to copy my setting..
ZecMiner64.exe -zpool zec-eu1.dwarfpool.com:3333 -zwal "my adress"."worker" -zpsw x -allpools 1 -i 6 -mport -3333 -tstop 76
maybee there is an hidden eror... if you figured out what was the error let me know, kinda currious

gl
I've tried your settings and -allpools 1 too.. Result is the same. ;-(
But when i try to run miner on direct internet connection - everything is ok!
When i run it through ssh tunnel (key factor) i have a problems i've described ealier ;-(
i have a problem only when i run miner through ssh tunnel..
unfortunately i have no direct internet connection in my place :-(
BTW thank you for efforts to help me.