Clarrion performance questions

I am measuring performance on my clariion using analyser and have the below data, collected over a period of 3 hours during work hours ( this is indicative of the workload durings other days ). As per my understanding from the help pages my clariion seems to have a Low workload and clariion which is performing well.

But I needed a confirmation and also relations between the values, For eg, the help says
Idle Flush: Idle flushes indicate a low workload.
High Water: The higher the number, the greater the write workload coming from the host.
Flush Ratio: A lower number indicates better performance
Low Water: The higher the number, the greater the write workload coming from the host.
Write Cache Flushes/s : This value indicates back-end workload.
So, how much is high and how much is low?

My clariion cache information:
CX3-80
SPA and SPB memory = 8192MB each
Low watermark=60%
High watermark=80%

Some of the performance stats:
Utilization(%) = 32 - 50 ( One spike of 80 )
Queue Length = 9 ( one spike of 70 )
Respone Time (ms) = Mostly around the 5 mark with a spike of 24
Total Bandwitdh (MB/s) = 30 MB/s
Total Throughput (IO/sec) = 900 - 2000 I/O/sec
Read Size (KB)=8 - 20
Write Size (KB) = 18 - 25
Dirty Page (%) = 60 To 99 ( avg around 76% )
Write size = 14 - 32KB (mostly around 24KB)
MBs Flushed = 24 MB/s on avg and some spikes of 56MB
Flush ratio of around 0.4
High water Flush On = 0-3
Idle Flush on = 1025 to 2500 ( avg around 1500)
Low Water Flush off = 0-3
Write cache flushes/s = 130 - 600 ( avg 320)
Avg Busy Queue length = 5 - 16 ( with one spike of around 82)
Service Time (ms) = 0.25 - 0.4

Would be great if some one could help me out with this.

Thank you,
ashish