"Now if I have a power outage and some data is not yet written to HDD, will I lose those queued writes even though the SDD is non-volatile; i.e. where are the writes queued and will they still be synced after a reboot?? Thanks for your help! "
No you will not lose the queued writes.
All of the cached data on the SSD still resides on the SSD even during a dirty shutdown.
If you think about it, most of the data on the SSD won't be written to the HDD in Maximized mode.... otherwise we'd notice a huge delay during a normal shutdown (i.e. if all the cached data was sent to the HDD). My SSD is 40GB, that is a lot of data to cache, I can tell you that when I shutdown it doesn't take very long.
Another thing I noticed with my Z68 system is that when I reboot and enter the RAID OROM (Ctrl+I), I can see if the data is "In Sync" or "Not in Sync" under the Acceleration Options menu. The RAID OROM will also let me synchronize the data from the SSD to the HDD.
I have also "mocked" a power outage on my system out of curiousity and confirmed my new files were still seen.