Make sight range increase more the less your special is, like HP or other derived statics.
Close combat chars (melee, flamer, smg ) already have a hard time getting close to an opponent, its even worse when you can't even see where the enemies are shooting from, so an increase in sight range at lower PE levels can help to make a decent char without having to put 6 in PE. Im not saying that a char with 1PE should have a lot of sight, but at least if you have 3 or 4 in PE you should have a decent sight range.