please try to underclock to 215.625

and to 206.25






the above codes were from my hand calculations, GH speeds added. 215.625 gives me 1100Gh and less than 1.1% error rate



https://bitcointalk.org/index.php?topic=589429.msg6485048#msg6485048

so 206.25

and 215.625   were both developed by klondike_bar

        option 'freq_value'    '6206'  #215.625M
        option 'chip_freq'     '215.625'        
        option 'timeout'       '18'   maybe 17

        #option 'freq_value'    '5002'  #206.25M  
        #option 'chip_freq'     '206.25'          
        #option 'timeout'       '19'  maybe 20


these 2 can be tested