Struggling With Low Speeds < 15MBps Over Gigabit

NAS Tester Results:

Full Data Journaling - ENABLED
Running a 400MB file WRITE on drive V: 5 times...
Iteration 1: 29.96 MB/sec
Iteration 2: 28.19 MB/sec
Iteration 3: 28.55 MB/sec
Iteration 4: 27.59 MB/sec
Iteration 5: 27.01 MB/sec
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Average (WRITE): 28.26 MB/sec
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Running a 400MB file READ on drive V: 5 times...
Iteration 1: 112.68 MB/sec
Iteration 2: 108.40 MB/sec
Iteration 3: 109.29 MB/sec
Iteration 4: 114.94 MB/sec
Iteration 5: 114.61 MB/sec
------------------------------
Average (READ): 111.98 MB/sec
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Achievement unlocked: 100MB+/sec read speed!

I then changed the 'Disable Full Data Journaling' option to [Checked] and rebooted the ReadyNAS.

Full Data Journaling - DISABLED
Running a 400MB file WRITE on drive V: 5 times...
Iteration 1: 77.86 MB/sec
Iteration 2: 69.94 MB/sec
Iteration 3: 65.04 MB/sec
Iteration 4: 74.91 MB/sec
Iteration 5: 69.81 MB/sec
------------------------------
Average (WRITE): 71.51 MB/sec
------------------------------
Running a 400MB file READ on drive V: 5 times...
Iteration 1: 105.82 MB/sec
Iteration 2: 109.59 MB/sec
Iteration 3: 108.70 MB/sec
Iteration 4: 108.99 MB/sec
Iteration 5: 109.89 MB/sec
------------------------------
Average (READ): 108.60 MB/sec
------------------------------
Achievement unlocked: 100MB+/sec read speed!