As explained you need.the extra length to get full droop on the outside holes.
shiming the bump stop will get rid of what your worrying about. Honestly though if you have bad enough crash to hit something at the right angle to push one wheel to full travel, you will have been proper unlucky. More likly for tje nut to dig in and bust the tower or rip the cap off.
Lots of drivers remove the droop screws this gains 2-3mm, handy on bumpy tracks when jumping and landing on rough ground.
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