Does anyone else experience jittery playback even with Mac Pro 2013?

I completed installing all my software on a new Mac Pro late 2013 and eagerly began working in Final Cut Pro 10.1.1 to see how much more improved my editing experience would be versus my old 2010 27" iMac. I was already experiencing jittery playback that would occur usually right after clicking the play button, but I'm sad to say that I'm still having that issue with the new computer.
My specs are:
3ghz 8-core xeon, 32 GB RAM, dual Firepro D-500 graphics and my projects are not stored on a Pegasus R6 thunderbolt RAID 5.
I really expected skimming and playing back smoother like a hot knife through butter, but I'm dissapointed. I don't know if this is just a FCPX issue that still needs fixing, or if it's something that everybody experiences.

Thank you Russ. Here's more info and also when I said my projects were "not" stored on the RAID, that was a typo. They ARE stored in the same Library as the event on the RAID.
Media originals: H.264 MOV files shot with Canon DSLR at 23.98 fps 1920x1080.
Transcoded files: Optimized and Proxy
Project settings: Manually set at 1920x1080, 23.98fps, Pro Res 422, 48kHz sound.
Project playback: Proxy mode
There are no multicam clips created. I've created a few compound clips, the majority of which are for the purpose of linking a video track to another audio track (syncing cleaner audio recording).
The Library contains the one project I'm working on (the wedding video) and the one Event that contains the media. The footage in the event is of a wedding day with about 1,100 clips total, all of which are identical in format and settings so there's no mixing of frame rates, etc. The Library is stored where I store all my other libraries from other jobs: On the external thunderbolt Pegasus RAID.
I don't have any other events in the Library. My workflow is to have a new Library created for each job and keep everything together in it.
The current project I'm working on was created on 10.1.
To be fair, I'd like to clarify that the jittery issue is not a constant and is not as bad as when I was working on my 2010 iMac using a single disc external firewire drive to store my libraries. On that machine, I accepted the playback issue considering my firewire wasn't fast enough. The jittery playback I experience now on the Mac Pro is very minimal (Like sometimes for about 2 seconds right as I click Play), but my concern is why do I have it at all considering my footage type isn't as demanding as say multicam clips or complex composites or 4K media, and that the Mac Pro combined with the RAID are so fast.
I may perhaps have unreasonable expectations from this machine. The reason I decided to invest in it was to have a glitch free editing experience and not have to worry about slowing myself down to let the computer catch up. The thing is, If this is normal, then my frugal mind would tell me why not return this expensive Mac Pro and save thousands with a maxed-out new iMac combined with my thunderbolt RAID?

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