Need some input.

I have 6x GTX1060 on my rig connected to Biostar TB350 motherboard.
Gigabyte and Zotac has Hynix memory, Asus has Micron.

PCIe 1_1 slot = Gigabyte Windforce OC 6GB
PCIe 16_1 slot = Zotac AMP! 6GB
PCIe 1_1 slot = Asus Strix OC 6GB
PCIe 1_1 slot = Asus Strix OC 6GB
PCIe 1_1 slot = Asus Strix OC 6GB
PCIe 1_1 slot = Asus Strix OC 6GB
PCIe 1_1 slot = Asus Strix OC 6GB

GPUZ and Afterburner tally with each other
GPU#0 Asus (Micron) 1961/4303 (PL 80, CC +175, MC +500)
GPU#1 Asus (Micron) 1974/4303 (PL 80, CC +175, MC +500)
GPU#2 Asus (Micron) 1999/4303 (PL 80, CC +200, MC +500)
GPU#3 Gigabyte (Hynix) 1797/4303 (PL 75, CC +200, MC +500)
GPU#4 Asus (Micron) 1961/4303 (PL 80, CC +175, MC +500)
GPU#5 Zotac (Hynix) 1797/4303 (PL 70, CC +175, MC +500)

*MC is being OC as I often switched to ETH mining.

This seems to be tally with MSI Afterburner.

My issue now is the hash rate that I got from one of the Asus card (GPU#04). Its hash rate is pretty low, upping the core clock or power limit doesn't seems to do much on the hash rate. Is the card fucked?.
Something like this.

Temp: GPU0: 58C GPU1: 56C GPU2: 57C GPU3: 63C GPU4: 55C GPU5: 64C
GPU0: 314 Sol/s GPU1: 313 Sol/s GPU2: 316 Sol/s GPU3: 291 Sol/s GPU4: 232 Sol/s GPU5: 286 Sol/s
Total speed: 1752 Sol/s
+-----+-------------+--------------+
| GPU | Power usage |  Efficiency  |
+-----+-------------+--------------+
|  0  |     93W     |  3.38 Sol/W  |
|  1  |     92W     |  3.40 Sol/W  |
|  2  |     94W     |  3.36 Sol/W  |
|  3  |     76W     |  3.83 Sol/W  |
|  4  |    104W     |  2.23 Sol/W  |
|  5  |     81W     |  3.53 Sol/W  |
+-----+-------------+--------------+

Does anyone have any idea what is wrong and what can I do to get normal hash rate from this one card?