Cool report, and great blog! Love the pictures, very well done! If I had anything to comment about, it would be your choice to spread the asteroid field and to joust the firesprays.
I think given that you were facing 3 large ships, crowding the asteroid field would have been preferable over placing them in the corners. Asteroids are not kind to large ships . Yes, you normally would want to spread out asteroids playing a "swarm" list with standard TIEs + Howl but you don't have that here. And yes, a 5-kturn does dictate a spread out field, but I still think with 3 large ships facing you, more asteroids would limit their movement much more than yours.
Both ships, firesprays and bombers want to joust. Firesprays get to use their rear arc with actions and Bombers can use their 5-kturn and avoid any unnecessary turning, something they're not fond of. That said, I think you took a lot of unnecessary damage by giving the Lambda an almost perfect approach for several turns. I think it'd be more appropriate to set up on the other side of the board, and force him those big ships through the asteroids. Yes, bombers are not great in an asteroid field, but a 3-turn combined with a barrel roll can really surprise you as to how tight that turn can be. You also could have gotten behind the lambda pretty easily looking at the board set up, or at least isolate it from the bounty hunters without much difficulty.
Compare and contrast your own and your opponent ships:
Lastly, given the MASSIVE blind spots of your opponent's ships, a tighter asteroid field combined with more difficulty in focus firing your 6 hp ships, would have very much benefited you. Next time, take some time to evaluate the pro's and cons of your opponent's ships compared to your own and then decide whether you want to joust or play the asteroid dog-fighting game. I think you could have won this handily if you chose to dogfight your opponent intend of jousting him due to your superior pilot skill and repositioning ability offered to you by barrel roll.
Overall, great report and I hope I did not come off as overly critical as that was not my intent. I also do love the bomber, and bombs are very underrated. Best of luck in the future, and look forward to your future posts!