In all the talk of graphical downgrades no one seems much preoccupied with 'why?'. Why build something and then proceed to tear it down, piece by piece, in the hope that ever more diminished expectations about the final product won't be severe enough to...
There's no distinct crest marker, so you just need to aim at the top of the helm.
Don't waste boosts just because you've got them. They don't disappear.
Upgrade your armour whenever you can, for things get tough pretty fast.