We do have mite problem in France, but excepted a few frames I can't inspect as they are stuck together, brood is healthy, no odour detected, bees are "normal", however I'm far from being an expert. About robbing, not sure how to detect it.
I agree with the patience, the good news is they survived last winter - a pretty cold one from our standard - without feeding them candy so they had enough stock, I was just anxious I did something wrong. I'm not in a hurry to get honey from them, anyway, swapping hives location with a strongest colony maybe something I will consider.
Thanks.