I finally got the 45 zeroes down. I got exactly 45
And it was the last plane before the level ends so I was really lucky.
And flow, suddenly doing the save and quit did work and I restarted on the last checkpoint. Go figure.
Now,I just need to beat the game on Veteran.
Already did the first 2 levels.
Man, Veteran is hard. You have to go really slow, prone and be really cautious and hope for the words "Checkpoint reached" to appear
PS - thanks flow