6x7970 - cards not running at full utilization

[flux]

Folks,

When testing my rig with mysql323 - I could get 97-99% utilization on each card.

I'm now working on some NTLM hashes (trying all upper /lower case with numbers and symbols) and the utilization is way lower. Here is the command and a summary of the utilization:

./oclHashcat64.bin -w 3 -i —gpu-temp-abort=95 -m 1000 -a 3 -l ?l?u?d -o cracked.hashes input.hashes

Session.Name...: oclHashcat
Status.........: Running
Input.Mode.....: Mask (?1?2?2?2?2?2?2?3?3?3) [10]
Hash.Target....: File ([REDACTED])
Hash.Type......: NTLM
Time.Started...: Thu Nov 6 17:20:34 2014 (12 mins, 28 secs)
Time.Estimated.: Sun Nov 9 10:55:08 2014 (2 days, 15 hours)
Speed.GPU.#1...: 6722.8 MH/s
Speed.GPU.#2...: 6729.6 MH/s
Speed.GPU.#3...: 6651.4 MH/s
Speed.GPU.#4...: 6665.9 MH/s
Speed.GPU.#5...: 6837.4 MH/s
Speed.GPU.#6...: 6814.0 MH/s
Speed.GPU.#*...: 40421.1 MH/s
Recovered......: 1/8 (12.50%) Digests, 0/1 (0.00%) Salts
Progress.......: 30233277235200/9301612953526272 (0.33%)
Skipped........: 0/30233277235200 (0.00%)
Rejected.......: 0/30233277235200 (0.00%)
HWMon.GPU.#1...: 84% Util, 69c Temp, 90% Fan
HWMon.GPU.#2...: 73% Util, 86c Temp, 100% Fan
HWMon.GPU.#3...: 73% Util, 70c Temp, 90% Fan
HWMon.GPU.#4...: 74% Util, 66c Temp, 90% Fan
HWMon.GPU.#5...: 73% Util, 76c Temp, 90% Fan
HWMon.GPU.#6...: 83% Util, 54c Temp, 90% Fan

Am I missing something here? How can I get 98%+ utilization across all of my cards?

Many thnx