Having very high reject rates with new rig running 2x r9 290 tri-x runni sgminer and 13.11 beta drivers. Bat file as follows

sgminer -o stratum+tcp://middlecoin.com:3333 -xxxx-p x -I 23 -w 256 --thread-concurrency 32765 --gpu-engine 1020 --gpu-memclock 1500 --gpu-fan 85 --temp-target 88 --temp-overheat 92 --temp-cutoff 98 --gpu-powertune 20

Can't get these cards running with cgminer at all.

Any suggestions?