Looks like autotune is shutting down chips on the last board. You have to turn off the autotune for chips 33-48 (only the ones with "0")

Try changing every "AIfDSo 0" to "aIfDSo 54". Capital A means autotune is ON and normal a means it's OFF. Reboot and you should see at least 19 GH/s.

.putstat.log is showing if you have network problems. That could slow down the miner. In this case, you do not have anything wrong with you connection.