I'm using the latest dmaxl cgminer for my Zeus Blizzards and getting good hashing on westhash. you can find it here:

 https://github.com/dmaxl/cgminer/releases

 i set the price and diff in my batch file. seems all ok.

here's my bat file:

cgminer.exe --scrypt -o stratum+tcp://stratum.westhash.com:3333 -u 1CXXXXXXXXXXXz.5 -p p=0.55;d=1024 --failover-only -o stratum+tcp://useast.wafflepool.com:3333 -u 1CXXXXXXXXXXXz -p d=1024 --failover-only -o stratum+tcp://us.clevermining.com:3333 -u 1CXXXXXXXXXXXz -p d=1024 -S //./COM4 -S //./COM29 -S //./COM30 -S //./COM31 -S //./COM32 -S //./COM33 -S //./COM34 --zeus-chips 6 --zeus-clock 340

Your Thunder should be able to run at clock speed of 342. A lot of guys on the Zeus forum recommend that for blizzards to9o...but i find the 340 works best for me.

Hope this is  a bit helpful.

My Antminer S1s and S3s aren't as stable as my Zeusminers on Westhash yet ...but their overall average is slightly better than Eligius and as good as BTCGuild. I think its just the way Antminers function. Will run them through the night.