I have noticed that looking at the list of miners below and comparing to the Accepted Shares output (have not gotten any rejects that I have seen) none of the Accepted Shares ever show for miner 5 or 6. I see GSF 0 the most which is expected as that is the R909 and I see GSH 1 and 2 frequently and GSF 1 through 4, but have yet to see 5 or 6.  The show to be hashing continually based on the listing below as an example.   I can see why 5 may not be getting any shares as that is the one that I need to tune the frequency, but I would think 6 should be working away.   

0: GSF 10070012: BM1397:06+ 550.00MHz T:550 P:550 (3:2)     |  100% WU:^96% | 2.294T / 2.134Th/s WU:29835.9/m
 1: GSH 10041663: BM1387:02+ 375.00MHz T:375 P:375 (100:50)  | 99.1% WU:^95% | 81.85G / 80.95Gh/s WU: 1130.9/m
 2: GSH 10038894: BM1387:02+ 375.00MHz T:375 P:375 (100:50)  | 98.8% WU:^94% | 83.98G / 80.72Gh/s WU: 1127.8/m
 3: GSF 10052154: BM1397:01+ 450.00MHz T:450 P:445 (28:14)   |  100% WU:^98% | 272.1G / 231.0Gh/s WU: 3227.6/m
 4: GSF 10053864: BM1397:01+ 450.00MHz T:450 P:450 (28:14)   |  100% WU:100% | 405.9G / 284.4Gh/s WU: 3973.2/m
 5: GSF 10050104: BM1397:01+ 440.00MHz T:440 P:347 (28:15)   |  100% WU: 58% | 119.0G / 134.0Gh/s WU: 1872.6/m
 6: GSF 10054544: BM1397:01+ 450.00MHz T:450 P:450 (28:14)   |  100% WU:100% | 339.5G / 270.1Gh/s WU: 3775.4/m