LOL!!! Super heroes are filled with inconsistencies that is why they are super heroes, so they can achieve what a regular joe can't!
On your last point, The Flash ate a lot for the caloric need, I would believe the body had to adjust in a certain way.
2.- One of the abilities of every super hero is the ability of being "normal" so even of his speed he must be able to express and comprehend as a regular joe.
4.- is the truest of all... if he is so fast nothing can take him by surprise or reach him.