Playback performance on Windows - REVERSE playback delay lag

Hello all. Allow me to apologize in advance for what will probably be a long post - I want to be as clear about this as I can, as I have been trying different things and searching/reading many forums trying to find a solution but without much luck. So I want to be clear and allow someone else searching to maybe find this.

First my Windows system specs - system I built myself:

Asus x99-e WS motherboard

Xeon e5 1650v3 (6-core Haswell-e processor at 3.5 Ghz)

Nvidia GTX 980ti 6GB (zotak factory overclocked card)

Windows 10 (does not have the 'anniversary update' installed yet)

64GB RAM

Various Drives (a 10-drive RAID array, a PCI SSD, a SATA SSD, and an m2 SSD - I have tried them all to eliminate the storage as a bottleneck)

There is no hardware i/o card in this system (no AJA or blackmagic etc card)

OK, so this is a relatively minor problem, but over time and especially when trying to be very precise, it can be a big pain. When viewing footage, whether it be in the source monitor or the timeline, reverse playback does not start immediately. For example, using the JKL keys, if I play forward with L, audio and video start up immediately, no delay, no lag. I can start and stop multiple times and it is perfectly responsive. But as soon as I try to play backwards, the audio starts right away but the video doesn't start until a second, sometimes 2 full seconds later - so I miss the first frames of footage playing backward, which when trying to be fast yet precise is quite annoying.

I feel like isn't the easiest thing to explain so to say it again, when I play footage forward it is great. When I play backward, the audio starts right away, but the video stays frozen for a second or two, then JUMPS to the current frame. Once it makes this jump it is fine, but every time I stop and then start reverse playback this happens. I have tried all types of footage (ProRes, ProRes HQ, ProRes Proxy - created both on mac os and on windows with miraizon's now-defunct plugin; DnxHD in both MOV and MXF; Cineform, h264, and  even a tiff sequence) and this problem persists. I have also tried playing back the footage from my various drives (all quite fast - see specs above) with the same results. I have also tried Premiere 2015.2, 2015.3, and 2017 - same thing.

On my same exact system, with the same exact clips - ALL formats work perfectly and are instantly responsive in both Resolve AND Avid MC. ONLY Premiere has this issue.

Additionally, I'm a freelancer, so I'm often working on Macs during the day. And on Mac Pros dating from 2009 to 2013 trash cans, I never have this problem either. I was not able to test all of my footage, but with DNX and Prores on mac, Premiere is perfectly responsive. (This is on macs both with and without hardware i/o cards).

So I have narrowed the issue down to Windows and Premiere... but what's the issue? I have updated drivers, tried a brand new install of 2017, and no changes. I have also tried ticking and unticking the "Intel hardware acceleration" (not exactly sure what it says but in media there is an option for h264 hardware acceleration and it makes no difference either). Everything else in Premiere is fine. Scrubbing is fast and responsive, playing frame by frame or in slow-mo (like holding k and l or k and j at the same time) is fine, forward or backward. This makes me think this is a bug more than a real performance issue.

Thanks for any help. Let me know if you need any more info. If necessary later tonight I can do a screen recording of the issue if it isn't clear.