The sizes of the maps caused by uberating them seemed to be random, so to test this, I uberated the same map over and over saving to differant locations
Yep the sizes are definantly random
The sizes of the maps made by uberation ranged by 24KB to 50KB
What the bloody hell?
How do I make sure uberation results in the smallest possible size? Is there any way to control the randomness?

ADDITION:
Hmm, uberation 3 alpha seems to be slighty less random, for example a map will range from 35kb to 45kb.. randomly. It's still random. An improvement, though.