Adjusting the spacing between small (2" x 2") tiles
To put this in perspective, with my current browser settings, 1/32" is only slightly wider than a capital 'I'. It's narrower than a piece of aggregate in sanded grout. 

Consider the following (scaled as 1 pixel = 1/32"):



Can you tell at a glance which gap is a pixel wider?  Keep in mind that it's even less perceptable with lower contrast.  How about this one?



Do a dry layout and have somebody else (preferably somebody who doesn't know about the spacing) look at it.  I'm guessing it isn't going to be noticable at all.  Truth be told, even a fantastic tiling job isn't going to maintain spacing tolerances of 1/32" on any consistent basis.