Uploading early will not speed up their reply. I was not aware that you could do this more than five days prior, but from what I have seen, the replies to early requests seem to be delayed anyway, so why do it and worry about them not replying? Also, it does not make sense that they would let you complete the form with the screening questions that far in advance? Makes the screening questions kind of meaningless? I still think it best the day before travel, just my opinion for what it is worth.