1) That is because the feed from the 200 amp fuse to splice block 100 is nothing more than two parallel runs of #10*. Block 100 powers almost every battery feed in the car (other than ABS, Cooling Fan and Pulse module). The power top motor/pump and power window battery feeds should come from a separate fuse in the little fuse box next to the battery, but they opted to put those high-current devices in with everything else. Had they done the same thing with the ABS controller, you'd see even more flickering. (*Actually, the 2007 service manual says two #10s, but my SE has only one #10 so I am not sure if ANY car actually got the two conductors.)

2) No, you are just over-critiquing the car and that is leading to you noticing normal characteristics of the car and thinking they may be problems.