is it normal that WU less than kh/s on 290 non x? I got 420 kh/s and WU 319 m/s.
is it normal that WU less than kh/s on 270x? I got 186 kh/s and WU 140-150 m/s.
WU should be about 90% of hash rate, just like regular Scrypt. But remember it takes many hours for the WU to stabilize. In the beginning, it will change significant amounts though it does it slowly.