Thanks for the hasty reply. I've tried placing a few of the asset tiles in at their normal size, without re-sizing in the game engine and the issue is still there. I'm just not sure how to handle it.
I've looked for other examples of the issue in some of the samples that come with construct. The space blaster's background panels have the issue, and they seem to solve it by overlapping the artwork by a couple pixels. The ghost shooter's tiled panels DON'T seem to have the issue for whatever reason.
I admit I don't have much experience working the engine, I'm the art dude and working in Construct is not my area of expertise. I'm also a bit (lot) anal about pixel perfection in my work normally. If there is a simple option to turn off aliasing or whatever for certain layers, that fixes this issue, great. If not, I'd just like to know what I'm dealing with so I can compensate my work to accommodate the engine.
It wouldn't even be such an issue, if the slight fuzziness of the edges didn't cause nasty visible seams during gameplay, especially while moving.