Corporal Levi
ninjadog of the decade
Nope - EVs usually only make a difference every 80 EVs in level 5 beginning at a number depending on the ending of the base stat, which for Diglett's Speed is a 76, so any amount of EVs 76 + 80 + 80 = 236 or above will boost Diglett's Speed by the same amount. You have 510 EVs in total, and the analyses only account for the EVs that matter, so extra EVs between the EVs that matter and 510 EVs (in this case between 508 and 510) do not make a difference.