Assuming an Associative Array object, are you aware that an Associative Array can have more than one of both columns and rows? In other words, your image can be one Array with spacings between columns and rows within it, rather than dealing with spacing between Arrays. Spacings are controlled by options in the Array command, and also controllable through the Properties box, if you didn't give it the spacing you want in the process of drawing it.

And they can be adjusted by grip-editing with those blue grip-arrows closest to the origin corner.
Or have I misunderstood what you're asking?
Kent Cooper, AIA