... and get lucky on Slush pool for example and submit a share right after normalization...
But renormalization is just some internal maintenance, it doesn't affect anything, even variance :-). I think that relation between score renormalization and reward is yet another myth :-).
I mean - absolute numbers in score are meaningless. Everything important is YOUR SCORE / POOL SCORE. And they're both renormalized in the same way. Pool renormalization is something similar like 50 / 100 == 5 / 10 => after renormalization, there are lower numbers, but nothing is affected.