Have you tried this list against stress dealers such as RAC with RC, stressbot, tacticians? Seems that this could be a serious problem with only straight greens.
I see that you got lucky and didn't have to deal with any of these for this tournament.
I faced a Fat Han/Stresshog (BTL-A4 w/ Ion Cannon and R3-A2) and won in round 4. My Defender's general outlook on stress is "we'd rather not be stressed". It doesn't really go further than that. They can both get re-rolls to attacks while carrying a stack of tokens, and can both still turn around with the white K-turn. Having an action is better, of course, but stress isn't crippling. These guys are single-action ships, with action-less attacks that each do more average damage than Soontir Fel with a Focus.
I think not having focus for defense would be the biggest drawback of stress. I guess even then you have 3h and 3s behind 3-4 green dice.
I'll have to try this list but I'm worried that it will get ripped apart by RAC/Fel that's becoming very popular.
It's awesome that you tried something different and even more so that you did so well. I bought the defender as my first ship after the core because I like it so much but never run it at tournament. You've inspired me to give it a try.