I did take a picture, not sure if there's an slight indent or if thats normal, maybe it was damaged during shipping, as it was shipped to my place.
I don't think I can see any observable deformations in the door, or the seal. It seems to close ok.
Chaff escaping seems to happen with any roast, I've only done 1/2lb, 8oz batches, it happens with some beans more than others due to having more chaff.
With lighter roasts there's less smoke of course, but still the air is leaking you can feel it more when you press cool and the fan speeds up.
I don't normally over roast my beans, i like them pretty light - medium. I usually err on the side of under roasting.
I do sometimes open the door during the roast, and of course then some chaff flies out, that's to be expected. I do roast under a vent but it's not so effective, especially if I did accidentally over roast.