Definately more defensive,most likely because its near the end of normal honey flows and lots of them have also been de-supered and transported off to the moors. Never really noticed any difference in there stings whatsoever.but i don't really have much reaction to stings,so someone more sensitive may notice?
There is no difference in the concentration of venom within the venom sac of the Honey bee. Foraging bees, whatever they are foraging on will not affect the peptides within the venom sac.
I think its more down to the individual and how they react to being stung.