I'd say you are seeing the same as I am with the same card in a Dell 1855. There is something wrong with the mpt driver and the disks when they are setup in a raid0 set. If you split the disks and use them as individual drives then you will get full performance.
It's also a known problem, though not being tracked very well.
http://lists.freebsd.org/pipermail/freebsd-scsi/2004-December/001577.html http://lists.freebsd.org/pipermail/freebsd-scsi/2004-December/001578.html
Doesn't look like (from viewcvs.cgi) there's been any recent work on this.
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