I have the same guitar and am also concerned about every little detail lol. Maybe we can help each other out? I saw that some of these questions have already been answered but Ill share my opinion too. Hopefully it helps!
1) the bridge pickup is kind of twisted - I believe whoever installed the pickup in the factory just drilled the screws a little bit twisted. It is possible to readjust by taking off the 4 corner screws, but I don't recommend it. unless done by a professional, might have to drill new holes. Ill upload a picture of what it looks like. The inside pickup can be adjusted using the middle left and middle right screw. I dont think that small of a defect will affect the sound, but I might be wrong. if you want to contact me privately, I can try to record some audio with mine and we can compare.
2) there’s some paint in the neck - I think quality control might be bad in these factories. They might have just had a little mistake on the paint. My pickup selector wobbles a lot in the middle position. and sometimes switching between pickups doesn't work. and I have a small scratch in the wood between my 2 pickups.
3) when I touch the sustaniac it moves easily as the synbucker - my sustaniac moves easily too, all pickups do. just like the bridge pickup... its adjustable depending on how you prefer your action. that way, you can always find the right range for the perfect sound, not too quiet, not too much static, etc...
Is your friend going to return the guitar? I got mine from Americanmusical.com , where did your friend get theirs?
Can you look at my post and help me out too? heres the link, its in the same forum.
View attachment 793