Spread is good, as bringing pokemon down to their knees is vital to winning any game. Pokemon have too much HP to be one-shotted nowadays, so you're relying on bench damage to fill in your gaps. Why do you think everyone praises Lucario and people are excited over Magmortar?
THAT BEING SAID, your snipers can't be fragile. Cloyster's mostly dead weight basic, Empoleon's merely average HP on the basic and stage 1, Ampharos relying on your opponent having energies when it attacks, it's not good. (Ampharos has an EXCELLENT body though. Just... The attack is horrid. Any decks using Amphy as a main attacker has problems right off the bat. One of them is fighting weakness :/)
So... The only reason Snipes aren't as nice as you might hope is 'cause of them being oneshotted constantly, and most of them having bad basics (Octillery is a pleasant exception) :/. Blissey's so incredible partially 'cause the basic doesn't ever have death problems. Do any snipers share this love? Not really :/