KPowers, you are overrating your looks and your two photos are awful. A bunch of girls on OKCupid explicitly have something like 'Don't message me if you have a shirtless pic in your profile', and there must be many more who feel the same way but don't explicitly state it. Now, it's clear that you're in decent shape, but to post a topless picture you need to look a little more like this guy
Notice that he's also topless in a natural environment (a beach), so he gets to show off his sick bod without coming across like a bro. Nix that picture immediately.
In your second photo, it looks like you took it yourself? You want women to think you have friends. Friends = they've vetted this guy and want to hang out with him = good thing. I'd aim for a profile picture of you, showing your face, taken by a friend, a photo of you doing some fun, a photo of you with a girl(s), and then another photo (make sure one of them shows your (clothed) body so they don't worry that you are a secret internet fatty). Also, while you're good looking enough to get responses from chicks, you're not good looking enough to get responses from hot chicks solely based on your look.
Dean, I'm really surprised your spam style works. What sort of girls are you getting responses from (education, age etc.).The photos you posted are good. I don't think there is a huge difference in looks between the first two, but you look a lot less terroristy in the second and I bet that's where the massive spike in responses came from.