PPro Performance Variance on Mac Pro 2013: CC Version 7.0 vs. Version 8.0

Hi,
I've been editing on a late 2013 Mac Pro model with Yosemite (see system specs in the JPEG below). I have really mixed results editing with the most up to date version of Premiere Pro CC. Playback in a timeline lags significantly with 4K and standard HD 1080p media and the software crashes more often than I would like. I have tried a few things like checking the permissions status of varying media and project folders. I do not use GPU-based rendering as that has been problematic, creating pink lines etc. in the resulting previews and exports. Even after previews are rendered for a timeline, playback still lags regardless of media resolution.
In general, as a Premiere project becomes more complex, crashes become more frequent and playback lags even more. Dynamic Linking with AE causes so many crashes that is basically not functional. The only plug-ins I'm using are Magic Bullet and FilmConvert.
I'm not a huge fan of the shift in workflow/edit logic in FCP X, and want to avoid making that transition if I can. In an attempt to test the varied performance of Premiere, I have reverted to a previous version, CC 7.0. MY initial testing shows that this version renders previews more quickly (still without GPU assistance) and playback seems to lag less. Of course I imported an XML from a project originating in V. 8.0 and there are a few translation issues mostly related to warp stabilizing and color correction, which can be fixed if the overall performance boost is greater.
I have read a handful of forums of users experiencing similar or even more drastic difficulty running Premiere on a new MacPro platform. I have explored some of the troubleshoots suggested, but no major changes in performance. It seems to be hit or miss in terms of Premiere/MacPros playing well together. Strange that no one factor can seem to be pinpointed.
Has anyone else been fiddling with this option of using a previous version of Premiere on a Mac Pro? Any success? Other suggestions to improve performance in the latest version?
Thanks!

I just had an interesting thought.
I use the method of dragging a clip to the "new item" button to create a matching sequence of my majority media type for a project. Have there been any bugs or issues reported with this technique on the latest version of Premiere Pro CC? This is a possibility I haven't yet explored in terms of the issues I am experiencing with playback. When this thought dawned on me today, I took a look at my sequence settings in a troublesome clip, and am not sure it quite matches up. In this example, details in screenshot below, my majority footage was shot on a Canon XA20. The resulting sequence is using at ARRI Cinema editing mode. That seems to be a mis-match, but maybe not? Thoughts? Suggestions? Helpful resources about "editing modes" and optimization for playback? Any help appreciated. Thanks!

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    J

    This is a User-to-User forum. We have no special Apple Insider information here.
    Apple itself is providing the most reliable information available.
    If you have no 'special insider information' then how do you know 'Apple itself is providing the most reliable information available.'
    If Apple wanted to give me a rough delievry window that would be great - even a 7 day window would allow us customers to make suitable arrangements beforehand.
    but no one else is doing any better.
    I use many creative tech/software companies everyday - almost all offer better customer service than Apple (some not by much I'll grant you - but still better). None have the blatant arrogance and attitude of total disregard for the customer who is spending money with them that Apple do.
    The tone of your reply implies that I'm being unreasonable in wishing to know ROUGHLY when a product I have spent several thousand pounds/dollars on, will be delivered to me.
    And then having complete communications blackout from the company I ordered it from, despite the fact that the delivery date I was given has changed on the website (Does this affect me - who knows!?) - forcing me to chase them continually. To no avail.
    J

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