Greetings Shawn.
You are correct not to interrupt, make excuses or apologise if you are corrected. Just listen. Respectful questions are more than OK. Sifu does like technical questions, IME, and you will get some good info with good questions. When you do get a correction from Sifu or a senior, thank them. “Thank you Sifu” or if it is Nick or someone at his rank “Thank you Sihing.” It is an honour to be corrected by Sifu in the old tradition, and you should work on his correction as much as you can. You don’t want the same correction again!
My best advice is to watch Sifu like a hawk, but discreetly. The mirrors are handy for this. If he does it, it is correct. If you see someone else, anyone else, doing the same move and it doesn’t look quite the same, work on Sifu’s version. He was trained from a young age by his family, and he quite literally has T’ai Chi pouring out of him when he teaches, you don’t want to miss a thing. Later, when you have your own kung fu, your forms may not look exactly like his (especially if you are built differently) but for now the fastest way forward is strict imitation.
Another good etiquette point is not to bring up other styles or teachers on the training floor. For training, if Sifu doesn’t teach it, it doesn’t exist. Why waste training time debating? Sifu can mention them, but not us. The tea room is a different story, but even there you should be respectful of other styles if you do mention them.
Whenever Sifu enters, you should stand up or stop what you are doing and respectfully greet him, even if you are the only one who does so. He may act like you don’t have to, but he secretly enjoys it. If you hand him anything, hand it to him with two hands, the same if you take anything from him, use two hands. Also, if he is lighting incense, you should stop what you are doing and stand quietly while he does so, looking discreetly at the pictures of the ancestors.
Very nice new shirts, contemporary. Now what am I going to do with my old shirts? I’ve got two different-era versions of the Hong Kong uniform as well…
I hope this helps, it sounds like you are doing fine. I live a looong way from Toronto, so I don’t get in as much as I used to, but if I see you there I’ll say hello.
Cheers!