Oh yeh,..You're absolutely correct! The brittle WAS easier to scrape of than the soft!...And, again I believe you're correct about the temp. too! The front hive DOES get more shade than the back two I think.
Oh, while I'm here...What is the "Peanut looking comb" jutting out from the rest of the comb?..I've seen pictures of this many times but I cant remember where at.