Fitting a Clark ramped barrel, they even suggest elongating the lower link hole (the one the slide release goes through).
I would not touch the top hole.
IMO, the key to accuracy in a 1911 is to have everything line up the same way for every shot. I would get the proper fitting link and consider elongating as a last resort.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
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Former President of the ECPT (Eifel Combat Pistol Team)