[cypher]

Checking on nests is tricky when they're still settling in, always a bit of a toss up between not wanting to disturb them but wanting to be sure they're ok!
As they're probably still sorting things out between themselves & adjusting to their new home I would leave things be for now but your idea for the log does sound like a good one, maybe give it a go when things calm down a bit more.
As for wheels you may be right about the larger running base on the noisier wheels but who knows with hams & their wheels, a law unto themselves lol! My Chinese loved all the wheels I tried her with except the silent spinner, she actually seemed scared of it! My only guess was that it was so white/bright & she liked running in something darker!