When it comes to bowing, I wouldn't sweat it. Bowing is not a part of western culture, it takes time to get it down. Even Japanese people new to aikido don't always follow the etiquette that they should, even though bowing is an important part of the culture. Especially now, there are very few opportunities to bow on your knees.
Mine? Don't ask your sensei what his day job is, he might be the top instructor for the region.