Well after some research, I ended up installing RadeonPro (why is this so out of date?`` Oh, how I miss you Nvidia Inspector - an amazing tool, immensely powerful and kept up to date).
I set the following:
[Visual Tab]
Anisotropic Filtering - 16x (Override Application - I also disabled AF in the game itself)
Tessellation Control - Application Controls
[Advanced Tab]
Force Triple-Buffering(OpenGL) *
Anisotropic optimization
Trilinear optimization
Flip Queue Size: 1
[Tweaks Tab]
VSync control: Always On (I made sure Vsync was disabled in game)
Triple Buffering: enabled
Force Process High Priority: Enabled **
* - likely unnecessary, this was enabled when selecting Dynamic Vsync, which I decided to test by changing to Always On so that I could control Triple-buffering and remove the "lock frame rate" setting; however, the frame rate was never locked in-game, but I do suspect "Always On" is more favorable.
** - I also suspect this setting to be unnecessary, however, it seemed a good idea to enable and I haven't conducted further testing with it disabled. [I've done enough testing, I've only troubleshooted since the game released. It's time I play, dammit!]
In RivaTuner, I set the framerate cap for GTA5.exe to be 59fps. I don't know if there is anything special in sticking with 59 instead of 60fps on a 60hz display, but forever ago I had read it was a good idea for whatever reason, and around that time I had actually noticed a positive benefit to reduction of frame display issues while avoiding actually enabling true Vsync.
In the end, with the right management of graphic settings, I have managed to reduce microstutter, though I do still get stuttering. This I cannot swear to be issues other than over-zealous graphic settings, however, it still seems like frame rate can drop more than it ought to. I have not tested my current settings with a single GPU; I might decide to take on that task tomorrow, however, I am itching to just get back into the game and get a feel for it so I can finally get back online with my buddies.
After repeated configuration tests, I feel I have removed the possibility that any issues are popping up due to my hardware/software configuration. It remains a remote possibility, however I feel it is almost certainly a software issue. Either the GPU drivers need further work, or the game needs a new patch. The ultimate answer is likely both. Hopefully this comes sooner rather than later, as it definitely seems that, regardless of a smooth or stuttering experience, multi-GPU utilization is not scaling nearly as well as it should.
edit:
`` I know why RadeonPro hasn't been further developed, and I figure I should make that bit clear. I still wish to voice my frustration that a tool as awesome as Nvidia Inspector remains in active development and immensely useful, whereas a similar tool for AMD drivers might as well be an ancient and rarely practiced cult belief as opposed to a powerful and routinely useful utility for power users. I had to use Nvidia Inspector often for the past few generations, during which I owned the following Nvidia products: an FX 5600, 8800 GT, 285 GTX, and finally 2x 560 Ti 2GB in SLI. Now with 2x 290X in Crossfire, I've got some adjustments to make. Losing extensive adaptability is not one I had hoped to make, but if things can be made to work well in the end (without significant delay, I guess I cannot complain too much. I'm simply a very impatient person, and having a desire to enjoy the best games while they are brand new, I expect multi-GPU setups to suffer some serious issues, I only hope they are kept minimized prior to resolution.
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