There's literally only 2 infantry in the entire game that can be body-shot by the Ramjet, Marksman and Engineers, so I have no idea where the problem is there.
Also, PICs and Ravs having a clip doesn't mean much...they still have a longer reload than any other gun in the game.
Go on, but most of those ideas just seem weird as hell when put along side other guns. They're already weird enough being one-shot-kill in a game where automatics take ten shots to the face to kill someone.