I agree there were a lot of variables at play in that last data sample.
Tonight I hope to try a more simplistic test with one character.
I plan on going to a low population area (the tavern in Atraxia's Haven) and repeat the Login/Logout test again.
If the numbers show there is still an increasing footprint then I'll look to expand the test to include multiple characters in the same location and see what the numbers look like.
From that we can see what additional tests may be necessary.