let us know when you have the MPIO info. my experience tells me MPIO can typically be better then any bond.

regarding the hardware:
you posted:
Results: 386 seeks/second, 2.59 ms random access time

those drives can do :
Average latency2.0ms
Random read seek time3.4ms
Random write seek time3.9ms

so not bad really.

The PERCs dont get updated firmware from LSI very often, i suspect this can be an issue.