After much hard testing (2 Weeks) I can now give you the best way to mine the cluster.
If you mine the cluster the best way is with more ram!!!
So to max block finds more ram is your friend.
Testing was done with:
HP DL580 G7
4 x E7-4850
128GB ram
With all 80 threads active.
The best settings I found to max block finding was 10 threads (around 80-140 hs) 8 instances, So 8 GB ram.
When mining the cluster hash speed is not so important as it is on a pool because its scanning 1 GB Pattern to build the block and because pools pay by hash speed but the cluster pays by block. But you still need abit of speed to find that pattern on the ram. Remember the block time is 2 mins so your rig has 2 mins to find the best pattern. And remember that each pattern (1gb ram instance) is not the same as the other.
On the cluster I found I got more blocks found with around 100 hash per sec on each 1 gb instance.
When making the bat files I added a new address to each one and called it instance 1, instance 2 and so on on the wallet. So I could see what was making the most coin.
So if you have a CPU that gives 400 hs and you have 8gb ram then set up 4 instances to connect to the cluster node.
This is for the cluster only. I have not tested 100% solo on my own wallet.
It will have no benerfit to the pool other than showing the pool has more miners.
Give it a go and see if it works for you
Raster.
EDIT:
I would also like to point out that in time mining is going to be hard.
We need to remember that the coin puts out around 720 blocks a day @ a block every 2 mins.
so in time there will be a point where even the cluster will become hard work to mine on and pool will become the only shore way to make coins. So make the most of the low network hash rates.
Interesting, in case your wondering i am plotting the time to find 500 blocks in a historical bar chart here: http://roi-coin-blockexplorer.roi-coin.com/hash
At the moment the average block find time is 146 seconds. ( with a low of 136 and high of 159 )