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I'm not sure I understand everything below but let's start with the poor I/O performance of this one disk ssdpool.
How was this pool created? Can you provide the syntax? Was it created with a slice or the whole disk?
I think you are also saying the entire system's performance is bad but I'm not following why.
as it turns out, the SSD seems to have nothing to with at all. IIRC the drastic disk IO performance decrease happened right at the same time when I upgraded my system from Oracle Solaris 11_11 to 11.1. It was then when I decided to buy a SSD to boost performance.
Do you happen to know if the upgrade would have made some tuning necessary on older systems?