Actually, we have not downscaled it, but introduced a 4th zoom level ;-)
Really!? Compare the grid between Live and Beta... there are more expansion slots fitted in and that's impossible (having them over land) on the scale of the grid as it is on the Live layout. The only way to fit in those extra expansion slots over land is to slightly downscale the original grid compared to the graphic of the land... by doing that there is room to add the extra expansion slots.
One point of comparison, in LIVE the far right row of the grid ends just below GBG, in Beta is now continues all the way up to near the settlement ship. I had my buildings right near the coast near the settlement and GE, now they have moved away and there is a row of expansion slots between them and the coast.
In Live I count the grid as being 16 expansion slots wide at it's widest point (just south of GBG straight across to the other coast), at the similar point in Beta it's now 18 expansions slots wide.
There is no way that could be fitted over the same graphic without slightly downsizing the grid in comparison to the graphic (they would be in the sea or over the coast otherwise).