It's remarkable that you continually refute your own claims while you stumble over the arguments made earlier.There actually is an instantaneous moment in time when we perceive the present. It's called perception.
I know what perception is. Our only perception is of time which has passed. The "instantaneous moment" is already in the past before we can perceive it, and in fact, takes even more time to compute in our brains after we have received the information. Furthermore, your perception is completely different than every other human being. We can look up at a star and understand we are looking at a star in present time, that is our perception. We are actually looking at a star from hundreds of years ago. The star may not even presently exist anymore. Our perception of present is always the past, it's physically impossible for it not to be.
You wrote: "The instant you experience as "present" is not in the present anymore, it can't be."
So yes, we have an instantaneous experience of the present. Your various arguments when / when not contradicting themselves suggests there never is a present condition (except when you contradict that argument), but only a past condition. I suppose you're suggesting the present has never occurred.