Hi there!
First posting after a long time
Don't have the game yet but skimming through the forums already because I have ordered it.
However this sounds really strange because as I understand it -3 is worst 0 is average and +3 is a bonus (or in case of heat not necessarily due to obvious reasons).
Now this looks like a bug to me and not like a "feature". Otherwise anyone has an explanation for this behavior?
Regards