Thanks again. I need to edit the main post with recent updates.
I got all 5 sets of engines working, A gimballed three and five Raptor cluster for the spaceship and booster, respectively. Three rings, 7 Raptor VAC for the ship and the others for the booster.
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The only issue I've been having is that the engines only seem to gimbal in one direction. A friend of mine is also having this issue. I'm seeing the same problem on stock engines as well, so I don't know if it's something about the game's install (not running any mods except my own and Hangar Extender).
Video of the stock "Vector" only responding to Yaw/Roll (A/D Q/E) input.
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My Raptor triplet showing the same problem.