I am very interested in how you get on because I have the same MP 1,1 that I intend to use as a slave.
I am just setting up the master (new rMBP) and I haven't tried the MP yet.
I have made some preparations: I got 32gb of ram, 2x850evo drives with icy dock sleds... and I got 2x slaed 3ghz chips to fit. The MP1,1 can be firmware updated to MP2,2 and then with some terminal fiddling it can then run 10.8.x (according to the interwebs).
What version of VEPro are you running? I ask because it looks to me like VePro5 needs 10.8 from what I have read...?
And then on to the SSD speeds... I have run Parkdale on the new 850evo and the performance is poor because of the the SATAII and also by PCIe1 (which is not good for the Sonnet etc cards)... I am really confused by this part... after far too much reading I don't have the answer to getting above 200mb/s...
Here's an example of a confusing thread on SSDs for the MP1,1 https://discussions.apple.com/thread/6779268?start=0&tstart=0