I don't believe the --avalon-auto feature works with the mini, but like my mini which came with a 850W Gold Evermax PSU your's may have the same PSU (you'll have to check), my runs comfortably at 400Mhz doing 63 ~ 65GH/s.

Whats the temperature in the room this rig is in? I'm surprised at how low your temps are.

Here is my mini settings. It's been running for over 8 hours at 400Mhz, the HW% is 0.8x

Avalon mini improved system heat dissipation (add aluminum platen and high speed fan) and DC-DC module (2 * HI-MOSFET). the chips operate stable under 375 MHz and still have some upside potential.

the miner count is a small bug here. if reduce the miner count to 16, the overall speed will reduce to about half(30-40GHs), this is a FPGA controller bug. so just maintain the miner count to 24 is ok.

we did a 36 hours burn-in test before shipment, which guarantee the minis is OK when we ship them. but during transportation, the vibrations will also cause some hardware problem when you received them. if you have some issues, please check all cables are fastened.

check cgminerapi log

[match_work_count1] => 1312
   [match_work_count2] => 1238
   [match_work_count3] => 1330
   [match_work_count4] => 1325
   [match_work_count5] => 1286
   [match_work_count6] => 1301
   [match_work_count7] => 1263
   [match_work_count8] => 1310
   [match_work_count9] => 1270
   [match_work_count10] => 1229
   [match_work_count11] => 1314
   [match_work_count12] => 1269
   [match_work_count13] => 1255
   [match_work_count14] => 1282
   [match_work_count15] => 1294
   [match_work_count16] => 1284
   [match_work_count17] => 0
   [match_work_count18] => 0
   [match_work_count19] => 0
   [match_work_count20] => 0
   [match_work_count21] => 0
   [match_work_count22] => 0
   [match_work_count23] => 0
   [match_work_count24] => 0

some chips wont work and stay at 0

same problem for 2 mini avalon and i have 2 other box not open

Someone here told me it really wasn't worth the effort or cost to OC the Avalon 4 module past 107GH/s as you get so little reward for doing it. So I have never brothered. But if you really want 120GH/s buy two Avalon Mini's!