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Why would you ever replace Homing Missiles with Concussion or Proton Torps? Homing Missiles let you re-roll your dice, no matter what. It's much more effective than the other two. I've used all three in many games and Homing Missiles are superior.
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Homers are better. They are also 1 point more expensive and we are all on a budget of points, so you are always making tradeoffs when designing a squad around your style and what else you have. Also, with all else being equal Homers, Protons and Concussion all have the same average damage (3 hits) and while you may get spikes and lows they all deal similar damage over time. When I need an extra point, its a common downgrade for me to take. Or to put it another way, its the same reason we all take Seismic Charges over Proton Bombs, just less extreme.
I think your load out is good, its just when I use seismic, I prefer PS 4+. Thats why I used the phrase "I would" in my reply. I do appreciate your style which relies on a lot of player skill for both bombs and missiles.
By the way I loved your battle report, I am going to need to give that squad a try sometime, been hankering to fly a Bomber squad again and its good to push my comfort zone.