Okay, here it is.
When the test lot placed right, I gave it a green circle, and it looks like this:
https://41.media.tumblr.com/c264bd5e8e88e74a65b6e2d8406b4571/tumblr_ngwoqshMRT1s873l7o6_r1_1280.jpg
When the test lot placed wrong, as if it 'switched' the eaves around I gave it a red circle, and it looks like this:
https://40.media.tumblr.com/99ff48ba66afbf23de383ace46e60a70/tumblr_ngwoqshMRT1s873l7o5_r1_1280.jpg
When the test lot placed wrong, as if it 'evened out' the eaves by giving every roof a bit of eave I gave it a blue circle, and it looks like this:
https://40.media.tumblr.com/78cf2cfef698fe5a93e10606cbdb6153/tumblr_ngwoqshMRT1s873l7o7_r1_1280.jpg
https://40.media.tumblr.com/9f9626aeba1cffffd6eca77e40777458/tumblr_ngwoqshMRT1s873l7o8_r1_1280.jpg
https://41.media.tumblr.com/2626518040a5daaa17db6aeda11188e2/tumblr_ngwoqshMRT1s873l7o9_r1_1280.jpg
https://41.media.tumblr.com/f867a64a0b3f9d12d34085182eeb3fa8/tumblr_ngwoqshMRT1s873l7o10_r1_1280.jpg
So it goes wrong pretty often. I'm sure there are other factors involved though, because my latest build did place right on a few blue circled lots, but I'm not sure what it is. It at least shows that eaves are weird sometimes.