download 1.4.3 if you really had devfee problem its fixed.
Also if devfee got stuck you didn't have those :
[2018-04-17 10:52:16] Pool sent a new job (ID: 606098711433573)
like hitmandn had.
[2018-04-17 10:53:05] Pool difficulty: 1531728
this is an insanely high diff the pool sets, it's a badly setup pool.
Try to set a static diff on the pool if they have that option.
V1.4.3 still old problem [2018-04-17 14:48:46] GPU0: 1981.0 H/S [T: 60c, RPM: 2540]
[2018-04-17 14:48:46] GPU1: 1980.0 H/S [T: 70c, RPM: 2537]
[2018-04-17 14:48:46] GPU2: 1980.0 H/S [T: 61c, RPM: 2548]
[2018-04-17 14:48:46] GPU3: 1986.0 H/S [T: 54c, RPM: 2483]
[2018-04-17 14:48:46] GPU4: 1985.0 H/S [T: 67c, RPM: 2517]
[2018-04-17 14:48:46] GPU5: 1984.0 H/S [T: 65c, RPM: 2496]
[2018-04-17 14:48:46] Total: 11896.0 H/S
-------------------------STATS-------------------------
Mining time: 0 days, 2 hours, 34 minutes, 20 seconds
Algo: ipbc
Pool Difficulty: 2000450 <--- THIS IS YOUR PROBLEMLatency: ~166 ms
Accepted/Total shares: 55/55 (100.0%)
Average 5 min. speed: 11898.0 H/s
Max speed: 11921.0 H/s
-------------------------------------------------------
[2018-04-17 14:50:46] GPU0: 1987.0 H/S [T: 60c, RPM: 2519]
[2018-04-17 14:50:46] GPU1: 1986.0 H/S [T: 70c, RPM: 2520]
[2018-04-17 14:50:46] GPU2: 1984.0 H/S [T: 61c, RPM: 2558]
[2018-04-17 14:50:46] GPU3: 1986.0 H/S [T: 55c, RPM: 2477]
[2018-04-17 14:50:46] GPU4: 1982.0 H/S [T: 66c, RPM: 2560]
[2018-04-17 14:50:46] GPU5: 1982.0 H/S [T: 65c, RPM: 2543]
[2018-04-17 14:50:46] Total: 11907.0 H/S
The Pool Difficulty is over 2 million for you... That is insanely high