Try T15x24 and open a google chrome window with some flashgame.
If that was for me, I got the cpu does not validate.
On a side note it took about 15 times of restarting the bat file to get the card back to 99% gpu load. Even trying the flash thing did not work.
As i saw it is a scrypt coin and with 15x24 i get better results , remove anything exept -H2 -i 0 -T15x24 . Can you post your actual overclock readings? 290 is good , but for scrypt i get 320 when overclocked.