Wow, never heard of warped CCB rotors. Because of what you said about babying it, I would bet my money on pad deposits as @LF4472 said. That is way more common. If it had been a manufacturing defect, it would have been noticeable from the get go. 400 miles of babying is just not enough to...
Throw a piece of folded sandpaper in your band wrench to minimize slippage. I would bet the filters are put on by a machine or at least some mechanical assistance device. I've always noticed even the filters I put on seem to be tighter when removing than when installed.
There isn't much point in comparing manufacturers. It is what is and can be quick or lengthy depending on what things might occur, like quality holds or transport issues. Recently, things have been reasonable and can be either side of 6 weeks by any amount of days. You just have to be patient...
I know you are looking for delivery updates and I don't know if this will still work, but use this link and enter your VIN (if they gave it to you) after the = up in the URL to look at your window sticker. Leave a space after the = .
https://cws.gm.com/vs-cws/vehshop/v2/vehicle/windowsticker?vin=
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